js封装、简单实例源码记录 / 憋错料

1、运动封装：doMove ( obj, attr, dir, target, endFn ) 加入回调、&&、||用法注释

<script>
var oBtn1 = document.getElementById(‘btn1‘);
var oDiv = document.getElementById(‘div1‘);

oBtn1.onclick = function () {

    // doMove ( oDiv, ‘width‘, 34, 600 );
    doMove ( oDiv, ‘left‘, 12, 900, function () {
        doMove ( oDiv, ‘top‘, 34, 500 );
    });

};

function doMove ( obj, attr, dir, target, endFn ) {

    dir = parseInt(getStyle( obj, attr )) < target ? dir : -dir;

    clearInterval( obj.timer );

    obj.timer = setInterval(function () {

        var speed = parseInt(getStyle( obj, attr )) + dir;            // 步长

        if ( speed > target && dir > 0 ||  speed < target && dir < 0  ) {
            speed = target;
        }

        obj.style[attr] = speed + ‘px‘;

        if ( speed == target ) {
            clearInterval( obj.timer );

            /*
            if ( endFn ) {
                endFn();
            }
            */
            endFn && endFn();  //只有endFn条件为真就会执行endFn()
            //alert(getStyle(obj, ‘left‘)||3);     //哪边为true就返回哪边  布尔、string、number、object、function
        }

    }, 30);
}

function getStyle ( obj, attr ) { return obj.currentStyle?obj.currentStyle[attr] : getComputedStyle( obj )[attr]; }
</script><script>
var oBtn1 = document.getElementById(‘btn1‘);
var oDiv = document.getElementById(‘div1‘);

oBtn1.onclick = function () {

    // doMove ( oDiv, ‘width‘, 34, 600 );
    doMove ( oDiv, ‘left‘, 12, 900, function () {
        doMove ( oDiv, ‘top‘, 34, 500 );
    });

};

function doMove ( obj, attr, dir, target, endFn ) {

    dir = parseInt(getStyle( obj, attr )) < target ? dir : -dir;

    clearInterval( obj.timer );

    obj.timer = setInterval(function () {

        var speed = parseInt(getStyle( obj, attr )) + dir;            // 步长

        if ( speed > target && dir > 0 ||  speed < target && dir < 0  ) {
            speed = target;
        }

        obj.style[attr] = speed + ‘px‘;

        if ( speed == target ) {
            clearInterval( obj.timer );

            /*
            if ( endFn ) {
                endFn();
            }
            */
            endFn && endFn();  //只有endFn条件为真就会执行endFn()
            //alert(getStyle(obj, ‘left‘)||3);     //哪边为true就返回哪边  布尔、string、number、object、function
        }

    }, 30);
}

function getStyle ( obj, attr ) { return obj.currentStyle?obj.currentStyle[attr] : getComputedStyle( obj )[attr]; }
</script>

通用动画js

2、ajax封装

function ajax(method, url, data, success) {
    var xhr = null;
    try {
        xhr = new XMLHttpRequest();
    } catch (e) {
        xhr = new ActiveXObject(‘Microsoft.XMLHTTP‘);
    }

    if (method == ‘get‘ && data) {
        url += ‘?‘ + encodeURI(data);
    }

    xhr.open(method,url,true);
    if (method == ‘get‘) {
        xhr.send();
    } else {
        xhr.setRequestHeader(‘content-type‘, ‘application/x-www-form-urlencoded‘);
        xhr.send(data);
    }

    xhr.onreadystatechange = function() {

        if ( xhr.readyState == 4 ) {
            if ( xhr.status == 200 ) {
                success && success(xhr.responseText);   //定义回调，并传入参数，客户端接收这个参数，并显示出来
            } else {
                alert(‘出错了,Err：‘ + xhr.status);
            }
        }

    }
}

ajax封装

//最好将监听放在open、send方法前面调用。xhr.onreadystatechange=function(){...};

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script src="ajax.js"></script>
<script>
window.onload = function() {

    var oBtn = document.getElementById(‘btn‘);

    oBtn.onclick = function() {

        /*ajax({
            url    :    ‘getNews.php‘,
            success : function(data) {
                //...
            }
        });*/

        ajax(‘get‘,‘getNews.php‘,‘‘,function(data) {
            var data = JSON.parse( data );

            var oUl = document.getElementById(‘ul1‘);
            var html = ‘‘;
            for (var i=0; i<data.length; i++) {
                html += ‘<li><a href="">‘+data[i].title+‘</a> [<span>‘+data[i].date+‘</span>]</li>‘;
            }
            oUl.innerHTML = html;
        });

        setInterval(function() {
            ajax(‘get‘,‘getNews.php‘,‘‘,function(data) {
                var data = JSON.parse( data );

                var oUl = document.getElementById(‘ul1‘);
                var html = ‘‘;
                for (var i=0; i<data.length; i++) {
                    html += ‘<li><a href="">‘+data[i].title+‘</a> [<span>‘+data[i].date+‘</span>]</li>‘;
                }
                oUl.innerHTML = html;
            });
        }, 1000);

    }
}
</script>
</head>

<body>
    <input type="button" value="按钮" id="btn" />
    <ul id="ul1"></ul>
</body>
</html>

定时刷新

3、定宽瀑布流

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
body {margin: 0;}
#ul1 {width: 1080px; margin: 100px auto 0;}
li { width: 247px; list-style: none; float: left; margin-right: 10px; }
li div {border: 1px solid #000; padding: 10px; margin-bottom: 10px;}
li div img { width: 225px; display: block;}
</style>
<script src="ajax.js"></script>
<script>
window.onload = function() {
    var oUL=document.getElementById(‘ul1‘);
    var aLi=oUL.getElementsByTagName(‘li‘);
    var iPage=1;
    var b = true;

    getList();

    function getList() {

        ajax(‘get‘, ‘getPics.php‘, ‘cPage=‘+iPage, function(data){

             var data=JSON.parse(data);

             if ( !data.length ) {
                //后续没有数据了
                return ;
             }

             for(var i=0; i<data.length; i++) {
                   //获取高度最短的li
                    var _index = getShort();

                    //创建3个节点div/img/p
                    var oDiv = document.createElement(‘div‘);
                    var oImg = document.createElement(‘img‘);
                    var oP = document.createElement(‘p‘);
                    oImg.src = data[i].preview;
                    oImg.style.width = ‘225px‘;// 同比例缩放
                    oImg.style.height =  data[i].height * ( 225 / data[i].width ) + ‘px‘;
                    oDiv.appendChild( oImg );
                    oP.innerHTML = data[i].title;
                    oDiv.appendChild( oP );
                    //最后节点永远放在高度最小的那列
                    aLi[_index].appendChild( oDiv );
             }
             b=true;
        });
    }

    window.onscroll = function() {
        var _index = getShort();
        var oLi = aLi[_index];

        var scrollTop=document.body.scrollTop||document.documentElement.scrollTop;

        if(getTop( oLi ) + oLi.offsetHeight < document.documentElement.clientHeight + scrollTop) {
             if(b) {
                  b=false;
                  iPage++;
                  getList();
             }
        }

    };

    function getShort(){
        var index=0;
        var s=aLi[index].offsetHeight;
        for(var i=0; i<aLi.length; i++) {
            if(s>aLi[i].offsetHeight) {
                index=i;
                s=aLi[i].offsetHeight;
            }
        }
        return index;
    }

    //最小的高度obj的top值
    function getTop(obj) {
        var iTop = 0;
        while(obj) {
            iTop += obj.offsetTop;
            obj = obj.offsetParent;
        }
        return iTop;
    }

};
</script>
</head>

<body>
    <ul id="ul1">
        <li></li>
          <li></li>
        <li></li>
        <li></li>
    </ul>
</body>
</html>

ajax定宽瀑布流

4、ajax留言（调用后台）

另外跨域域名下加‘Access-Control-Allow-Origin‘ ‘http://www.a.com‘; //这是允许访问该资源的域（服务器设置响应头信息，标准支持，ie不支持）

jsonp解决跨域

//ie支持此种跨域，标准不支持
  var oXDomainRequest = new XDomainRequest();
  oXDomainRequest.onload = function() {
   alert(this.responseText);
  }
  oXDomainRequest.open(‘get‘, ‘http://www.b.com/ajax.php‘, true);
  oXDomainRequest.send();

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
#div1 {width: 300px; height: 30px; border: 1px solid #000; position: relative;}
#div2 {width: 0; height: 30px; background: #CCC;}
#div3 {width: 300px; height: 30px; line-height: 30px; text-align: center; position: absolute; left: 0; top: 0;}
</style>
<script>
window.onload = function() {

    var oBtn = document.getElementById(‘btn‘);
    var oMyFile = document.getElementById(‘myFile‘);
    var oDiv1 = document.getElementById(‘div1‘);
    var oDiv2 = document.getElementById(‘div2‘);
    var oDiv3 = document.getElementById(‘div3‘);

    oBtn.onclick = function() {

        //alert(oMyFile.value);    //获取到的是file控件的value值，这个内容是显示给你看的文字，不是我们选择的文件

        //oMyFile.files file控件中选择的文件列表对象
        //alert(oMyFile.files);

        //我们是要通过ajax把oMyFile.files[0]数据发送给后端

        /*for (var attr in oMyFile.files[0]) {
            console.log( attr + ‘ : ‘ + oMyFile.files[0][attr] );
        }*/

        var xhr = new XMLHttpRequest();

        //
        xhr.onload = function() {
            //alert(1);
            //var d = JSON.parse(this.responseText);

            //alert(d.msg + ‘ : ‘ + d.url);

            alert(‘OK,上传完成‘);
        }

        //获得ajax上传对象upload。
        var oUpload = xhr.upload;
        oUpload.onprogress  = function(ev) {
            //console.log(ev.total + ‘ : ‘ + ev.loaded);
            //上传比例,loaded 已经上传大小，  total总大小
            var iScale = ev.loaded / ev.total;
            oDiv2.style.width = 300 * iScale + ‘px‘;
            oDiv3.innerHTML = Math.floor(iScale * 100) + ‘%‘;

        }
        //上传一般都用post上传
        xhr.open(‘post‘, ‘post_file.php‘, true);
        //设置发送文件的请求头
        xhr.setRequestHeader(‘X-Request-With‘, ‘XMLHttpRequest;‘);
        var oFormData = new FormData();    //通过FormData来构建提交数据
        oFormData.append(‘file‘, oMyFile.files[0]);
        xhr.send(oFormData);

    }

}
</script>
</head>

<body>
    <input type="file" id="myFile" /><input type="button" id="btn" value="上传" />
    <div id="div1">
        <div id="div2"></div>
        <div id="div3">0%</div>
    </div>
<form action="pp_files.php" method="post" enctype="multipart/form-data">
<!--enctype:multipart/form-data 发送文件头--->
</form>
</body>
</html>

ajax上传文件

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>留言本</title>
    <link rel="stylesheet" href="css.css" type="text/css" />
    <script src="ajax.js"></script>
    <script src="guestbook.js"></script>
</head>

<body>
    <div id="header"></div>

    <div id="container">

        <div id="list">
        <!--<dl>
                <dt>
                    <strong>zmouse</strong> 说 :
                </dt>
                <dd>内容</dd>
                <dd class="t">
                    <a href="javascript:;" id="support">顶(<span>0</span>)</a>
                     |
                    <a href="javascript:;" id="oppose">踩(<span>0</span>)</a>
                </dd>
            </dl>-->
        </div>
        <div id="showMore">显示更多...</div>

        <div id="sidebar">

            <div id="user" style="margin-bottom: 10px;">
                <h4><span id="userinfo"></span> <a href="" id="logout">退出</a></h4>
            </div>

            <!-- 注册 -->
            <div id="reg">
                <h4>注册</h4>
                <div>
                    <p>用户名：<input type="text" name="username" id="username1"></p>
                    <p id="verifyUserNameMsg"></p>
                    <p>密码：<input type="password" name="password" id="password1"></p>
                    <p><input type="button" value="注册" id="btnReg" /></p>
                </div>
            </div>

            <!-- 登陆 -->
            <div id="login">
                <h4>登陆</h4>
                <div>
                    <p>用户名：<input type="text" name="username2" id="username2"></p>
                    <p>密码：<input type="password" name="password2" id="password2"></p>
                    <p><input type="button" value="登陆" id="btnLogin" /></p>
                </div>
            </div>

            <!-- 留言发表 -->
            <div id="sendBox">
                <h4>发表留言</h4>
                <div>
                    <textarea id="content"></textarea>
                    <input type="button" value="提交" class="btn1" id="btnPost" />
                </div>
            </div>
        </div>

    </div>

</body>
</html>

留言HTML

window.onload = function() {

    var oUser = document.getElementById(‘user‘);
    var oReg = document.getElementById(‘reg‘);
    var oLogin = document.getElementById(‘login‘);
    var oUserInfo = document.getElementById(‘userinfo‘);
    var oList = document.getElementById(‘list‘);
    var iPage = 1;

    var oShowMore = document.getElementById(‘showMore‘);

    var oUsername1 = document.getElementById(‘username1‘);
    var oVerifyUserNameMsg = document.getElementById(‘verifyUserNameMsg‘);

    //初始化
    updateUserStatus();

    function updateUserStatus() {
        var uid = getCookie(‘uid‘);
        var username = getCookie(‘username‘);
        if (uid) {
            //如果是登陆状态
            oUser.style.display = ‘block‘;
            oUserInfo.innerHTML = username;
            oReg.style.display = ‘none‘;
            oLogin.style.display = ‘none‘;
        } else {
            oUser.style.display = ‘none‘;
            oUserInfo.innerHTML = ‘‘;
            oReg.style.display = ‘block‘;
            oLogin.style.display = ‘block‘;
        }
    }

    showList();

    /*
    验证用户名
    get
        guestbook/index.php
            m : index
            a : verifyUserName
            username : 要验证的用户名
        返回
            {
                code : 返回的信息代码 0 = 没有错误，1 = 有错误
                message : 返回的信息 具体返回信息
            }
    */
    oUsername1.onblur = function() {
        ajax(‘get‘, ‘guestbook/index.php‘, ‘m=index&a=verifyUserName&username=‘ + this.value, function(data) {
            //alert(data);
            var d = JSON.parse(data);

            oVerifyUserNameMsg.innerHTML = d.message;

            if (d.code) {
                oVerifyUserNameMsg.style.color = ‘red‘;
            } else {
                oVerifyUserNameMsg.style.color = ‘green‘;
            }
        });
    }

    /*
    用户注册
    get/post
        guestbook/index.php
            m : index
            a : reg
            username : 要注册的用户名
            password : 注册的密码
        返回
            {
                code : 返回的信息代码 0 = 没有错误，1 = 有错误
                message : 返回的信息 具体返回信息
            }
    */
    var oPassword1 = document.getElementById(‘password1‘);
    var oRegBtn = document.getElementById(‘btnReg‘);
    oRegBtn.onclick = function() {

        ajax(‘post‘, ‘guestbook/index.php‘, ‘m=index&a=reg&username=‘+encodeURI(oUsername1.value)+‘&password=‘ + oPassword1.value, function(data) {
            var d = JSON.parse(data);
            alert(d.message);

        });

    }

    /*
    用户登陆
    get/post
        guestbook/index.php
            m : index
            a : login
            username : 要登陆的用户名
            password : 登陆的密码
        返回
            {
                code : 返回的信息代码 0 = 没有错误，1 = 有错误
                message : 返回的信息 具体返回信息
            }
    */
    var oUsername2 = document.getElementById(‘username2‘);
    var oPassword2 = document.getElementById(‘password2‘);
    var oLoginBtn = document.getElementById(‘btnLogin‘);
    oLoginBtn.onclick = function() {

        ajax(‘post‘, ‘guestbook/index.php‘, ‘m=index&a=login&username=‘+encodeURI(oUsername2.value)+‘&password=‘ + oPassword2.value, function(data) {
            var d = JSON.parse(data);
            alert(d.message);

            if (!d.code) {
                updateUserStatus();
            }

        });

    }

    /*
    用户退出
    get/post
        guestbook/index.php
            m : index
            a : logout
        返回
            {
                code : 返回的信息代码 0 = 没有错误，1 = 有错误
                message : 返回的信息 具体返回信息
            }
    */
    var oLogout = document.getElementById(‘logout‘);
    oLogout.onclick = function() {

        ajax(‘get‘, ‘guestbook/index.php‘, ‘m=index&a=logout‘, function(data) {

            var d = JSON.parse(data);
            alert(d.message);

            if (!d.code) {
                //退出成功
                updateUserStatus();
            }

        });

        return false;

    }

    /*
    留言
    post
        guestbook/index.php
            m : index
            a : send
            content : 留言内容
        返回
            {
                code : 返回的信息代码 0 = 没有错误，1 = 有错误
                data : 返回成功的留言的详细信息
                    {
                        cid : 留言id
                        content : 留言内容
                        uid : 留言人的id
                        username : 留言人的名称
                        dateline : 留言的时间戳(秒)
                        support : 当前这条留言的顶的数量
                        oppose : 当前这条留言的踩的数量
                    }
                message : 返回的信息 具体返回信息
            }
    */
    var oContent = document.getElementById(‘content‘);
    var oPostBtn = document.getElementById(‘btnPost‘);
    oPostBtn.onclick = function() {

        ajax(‘post‘, ‘guestbook/index.php‘, ‘m=index&a=send&content=‘+encodeURI(oContent.value), function(data) {

            var d = JSON.parse(data);
            //alert(d.message);

            if (!d.code) {
                //添加当前留言到列表中
                createList(d.data, true);
            }

        });

    }

    //从后台返回的json的data
    function createList(data, insert) {
        var oDl = document.createElement(‘dl‘);

        var oDt = document.createElement(‘dt‘);
        var oStrong = document.createElement(‘strong‘);
        oStrong.innerHTML = data.username;
        oDt.appendChild(oStrong);

        var oDd1 = document.createElement(‘dd‘);
        oDd1.innerHTML = data.content;

        var oDd2 = document.createElement(‘dd‘);
        oDd2.className = ‘t‘;
        var oA1 = document.createElement(‘a‘);
        oA1.href = ‘‘;
        oA1.innerHTML = ‘顶(<span>‘+data.support+‘</span>)‘;
        var oA2 = document.createElement(‘a‘);
        oA2.href = ‘‘;
        oA2.innerHTML = ‘踩(<span>‘+data.oppose+‘</span>)‘;
        oDd2.appendChild(oA1);
        oDd2.appendChild(oA2);

        oDl.appendChild(oDt);
        oDl.appendChild(oDd1);
        oDl.appendChild(oDd2);

        //oList存在留言就在oList前面插入留言insertBefore,否则直接插入留言appendChild
        if (insert && oList.children[0]) {
            oList.insertBefore(oDl, oList.children[0]);
        } else {
            oList.appendChild(oDl);
        }
    }

    //点击显示更多的内容
    oShowMore.onclick = function() {
        iPage++;
        showList();
    }

    function showList() {
        /*
        初始化留言列表
        get
            guestbook/index.php
                m : index
                a : getList
                page : 获取的留言的页码，默认为1
                n : 每页显示的条数，默认为10
            返回
                {
                    code : 返回的信息代码 0 = 没有错误，1 = 有错误
                    data : 返回成功的留言的详细信息
                        {
                            cid : 留言id
                            content : 留言内容
                            uid : 留言人的id
                            username : 留言人的名称
                            dateline : 留言的时间戳(秒)
                            support : 当前这条留言的顶的数量
                            oppose : 当前这条留言的踩的数量
                        }
                    message : 返回的信息 具体返回信息
                }
        */
        ajax(‘get‘, ‘guestbook/index.php‘, ‘m=index&a=getList&n=2&page=‘ + iPage, function(data) {

            var d = JSON.parse(data);

            var data = d.data;

            if (data) {
                for (var i=0; i<data.list.length; i++) {
                    createList(data.list[i]);
                }
            } else {
                if (iPage == 1) {
                    oList.innerHTML = ‘现在还没有留言，快来抢沙发...‘;
                }
                oShowMore.style.display = ‘none‘;
            }

        });
    }
};

function getCookie(key) {
    var arr1 = document.cookie.split(‘; ‘);
    for (var i=0; i<arr1.length; i++) {
        var arr2 = arr1[i].split(‘=‘);
        if (arr2[0]==key) {
            return arr2[1];
        }
    }
}

留言ajax

5、canvas旋转并缩放

window.onload=function(){
   var can=document.getElementById(‘canvas‘);
   var canvas=can.getContext(‘2d‘);
   var num=0;
   var num2=0;
   var value=1;
   canvas.translate(100,100);

   setInterval(function(){
         num++;
         canvas.save();
         canvas.clearRect(0,0,can.width,can.height);
         if(num2==100) vlaue=-1;
         else if(num2==0) value=1;
         num2+=value;
         canvas.translate(-50,-50);
         canvas.rotate(num*Math.PI/180);
         canvas.scale(num2*1/50,num2*1/50);
         canvas.fillRect(0,0,100,100,false);
         canvas.restore();
         canvas.stroke();
   }, 30);

};

旋转缩放

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script>
window.onload=function(){
   var aInput=document.getElementsByTagName(‘input‘);
   var oImg=document.getElementById(‘img1‘);

   var yImg=new Image();

   yImg.onload=function() {
        draw(oImg);
   };

   yImg.src=oImg.src;

   function draw(obj){
       var oC=document.createElement(‘canvas‘);
       var canvas=oC.getContext(‘2d‘);
       var iNow=1;
       oC.width=obj.width;
       oC.height=obj.height;
       obj.parentNode.replaceChild(oC,obj);
       canvas.drawImage(obj,0,0);

       aInput[1].onclick=function(){

           if(iNow==3) iNow=0; else iNow++;

           toChange();
       };
       aInput[0].onclick=function(){
           if(iNow==0) iNow=3; else iNow--;
           toChange();
       };
       function toChange(){
           switch(iNow){
               case 1:
                   oC.width=obj.height;
                   oC.height=obj.width;
                   canvas.rotate(90*Math.PI/180);
                   canvas.drawImage(obj,0,-obj.height);
               break;

               case 2:
                   oC.width=obj.width;
                   oC.height=obj.height;
                   canvas.rotate(180*Math.PI/180);
                   canvas.drawImage(obj,-obj.width,-obj.height);
               break;
               case 3:
                   oC.width=obj.height;
                   oC.height=obj.width;
                   canvas.rotate(270*Math.PI/180);
                   canvas.drawImage(obj,-obj.width,0);
               break;
               case 0:
                   oC.width=obj.width;
                   oC.height=obj.height;
                   canvas.rotate(0*Math.PI/180);
                   canvas.drawImage(obj,0,0);
               break;
           }
       }
   }
};
</script>
</head>

<body>
<input type="button" value="左"/>
<input type="button" value="右"/>
<div><img src="iBannerText.png" id="img1" /></div>
</body>
</html>

旋转

window.onload=function(){
    var oc=document.getElementById(‘canvas‘);
    var canvas=oc.getContext(‘2d‘);
    canvas.fillRect(0,0,100,100);
    var oImg=canvas.getImageData(0,0,100,100);  //返回图像像素

    for(var i=0; i<oImg.width*oImg.height; i++) {
        oImg.data[4*i]=255;   //data数组中的每个像素都rgba四个构成， length=4*w*h
        oImg.data[4*i+1]=0;
        oImg.data[4*i+2]=0;
        oImg.data[4*i+3]=50;
    }

    canvas.putImageData(oImg, 100,100); //绘制图像像素至canvas中
};

canva像素操作

 1 <!doctype html>
 2 <html>
 3 <head>
 4 <meta charset="utf-8">
 5 <title>无标题文档</title>
 6 <script>
 7 window.onload=function(){
 8     var oc=document.getElementById(‘canvas‘);
 9     var canvas=oc.getContext(‘2d‘);
10
11     var aLi=document.getElementsByTagName(‘li‘);
12     for(var i=0; i<aLi.length; i++){
13         aLi[i].onclick=function() {
14             var str=this.innerHTML;
15             var h=180;
16             canvas.clearRect(0, 0, oc.width, oc.height);
17             canvas.font=h+‘px impact‘;
18             canvas.textBaseline=‘top‘;
19             canvas.fillStyle=‘red‘;
20             var w=canvas.measureText(str).width;
21             canvas.fillText(str, (oc.width-w)/2, (oc.height-h)/2);
22             var oImg=canvas.getImageData((oc.width-w)/2, (oc.height-h)/2, w,h);
23             canvas.clearRect(0,0,oc.width,oc.height);
24             var arr=randomArr(w*h,w*h/10);
25             var newImg=canvas.createImageData(w,h);  //创建一个新的img图片像素
26             for(var i=0; i<arr.length; i++) {
27                 //旧的像素数组，赋值给新的像素数组当中
28                 newImg.data[4*arr[i]]=oImg.data[4*arr[i]];
29                 newImg.data[4*arr[i]+1]=oImg.data[4*arr[i]+1];
30                 newImg.data[4*arr[i]+2]=oImg.data[4*arr[i]+2];
31                 newImg.data[4*arr[i]+3]=oImg.data[4*arr[i]+3];
32             }
33
34             //绘制像素图片到canvas中
35             canvas.putImageData(newImg, (oc.width-w)/2, (oc.height-h)/2);
36
37         };
38     }
39
40     //函数功能：iAll，iNow(原数组长度，新数组长度) 返回新的数组
41     function randomArr(iAll, iNow){
42         var arr=[];
43         var newArr=[];
44         for(var i=0; i<iAll; i++) {
45            arr.push(i);
46         }
47         for(var i=0; i<iNow; i++) {
48            newArr.push(arr.splice(Math.floor(Math.random()*arr.length),1));
49         }
50         return newArr;
51     }
52
53 };
54 </script>
55 </head>
56
57 <body>
58
59 <canvas id="canvas" width=500 height=500></canvas>
60 <ul style="float:left">
61 <li>我</li>
62 <li>爱</li>
63 <li>你</li>
64 <li>吗</li>
65 </ul>
66 </body>
67 </html>

图片像素生产10%的图片文字

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script>
window.onload=function(){
    var oc=document.getElementById(‘canvas‘);
    var canvas=oc.getContext(‘2d‘);

    var aLi=document.getElementsByTagName(‘li‘);
    for(var i=0; i<aLi.length; i++){
        aLi[i].onclick=function() {
            var str=this.innerHTML;
            var h=180;
            var timer=null;
            var iNow=0;
            clearInterval(timer);
            canvas.clearRect(0, 0, oc.width, oc.height);
            canvas.font=h+‘px impact‘;
            canvas.textBaseline=‘top‘;
            canvas.fillStyle=‘red‘;
            var w=canvas.measureText(str).width;
            canvas.fillText(str, (oc.width-w)/2, (oc.height-h)/2);
            var oImg=canvas.getImageData((oc.width-w)/2, (oc.height-h)/2, w,h);
            canvas.clearRect(0,0,oc.width,oc.height);
            var arr=randomArr(w*h,w*h/10);
            var newImg=canvas.createImageData(w,h);  //创建一个新的img图片像素
            timer=setInterval(function(){
                for(var i=0; i<arr[iNow].length; i++) {
                    //旧的像素数组，赋值给新的像素数组当中
                    newImg.data[4*arr[iNow][i]]=oImg.data[4*arr[iNow][i]];
                    newImg.data[4*arr[iNow][i]+1]=oImg.data[4*arr[iNow][i]+1];
                    newImg.data[4*arr[iNow][i]+2]=oImg.data[4*arr[iNow][i]+2];
                    newImg.data[4*arr[iNow][i]+3]=oImg.data[4*arr[iNow][i]+3];
                   }
                    //绘制像素图片到canvas中
                canvas.putImageData(newImg, (oc.width-w)/2, (oc.height-h)/2);
                if(iNow==9)  {
                    iNow=0;
                    clearInterval(timer);
                }
                else iNow++;
            }, 200);

        };
    }

    //函数功能：iAll，iNow(原数组长度，新数组长度) 返回复合的数组，allArr存的就是10个元素，每个元素也是一位数组，leng=w*h;
    function randomArr(iAll, iNow){
        var arr=[];
        var allArr=[];
        for(var i=0; i<iAll; i++) {
           arr.push(i);
        }

        for(var j=0; j<iAll/iNow; j++) {
            var newArr=[];
            for(var i=0; i<iNow; i++) {
               newArr.push(arr.splice(Math.floor(Math.random()*arr.length),1));
            }
            allArr.push(newArr);
        }

        return allArr;
    }

};
</script>
</head>

<body>

<canvas id="canvas" width=500 height=500></canvas>
<ul style="float:left">
<li>我</li>
<li>爱</li>
<li>你</li>
<li>吗</li>
</ul>
</body>
</html>

动态生产每次10%文字像素

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script>
window.onload=function(){
    var oc=document.getElementById(‘canvas‘);
    var canvas=oc.getContext(‘2d‘);
    canvas.fillRect(0,0,100,100);
    var oImg=canvas.getImageData(0,0,100,100);
    alert(getXY(oImg, 3, 5));
    for(var i=0; i<oImg.width; i++){
        setXY(oImg, i, 5, [255,0,0,255]);
        canvas.putImageData(oImg,100,100);
    }
    function getXY(obj, x, y){
        var arr=[];
        var w=obj.width;
        var h=obj.height;
        var d=obj.data;

        arr[0]=d[4*(y*w+x)];
        arr[1]=d[4*(y*w+x)+1];
        arr[2]=d[4*(y*w+x)+2];
        arr[3]=d[4*(y*w+x)+3];
        return arr;
    }

    function setXY(obj, x, y,color){
        var arr=[];
        var w=obj.width;
        var h=obj.height;
        var d=obj.data;

        d[4*(y*w+x)]=color[0];
        d[4*(y*w+x)+1]=color[1];
        d[4*(y*w+x)+2]=color[2];
        d[4*(y*w+x)+3]=color[3];
    }
}
</script>
</head>

<body>

<canvas id="canvas" width=500 height=500></canvas>
</body>
</html>

封装通过xy坐标生成像素图片

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script>
window.onload=function(){
    var oc=document.getElementById(‘canvas‘);
    var canvas=oc.getContext(‘2d‘);
    var yImg=new Image();
    yImg.onload=function() {
        draw(this);
    };
    yImg.src=‘2.png‘;

    function getXY(obj, x, y){
        var arr=[];
        var w=obj.width;
        var h=obj.height;
        var d=obj.data;

        arr[0]=d[4*(y*w+x)];
        arr[1]=d[4*(y*w+x)+1];
        arr[2]=d[4*(y*w+x)+2];
        arr[3]=d[4*(y*w+x)+3];
        return arr;
    }

    function setXY(obj, x, y,color){
        var arr=[];
        var w=obj.width;
        var h=obj.height;
        var d=obj.data;

        d[4*(y*w+x)]=color[0];
        d[4*(y*w+x)+1]=color[1];
        d[4*(y*w+x)+2]=color[2];
        d[4*(y*w+x)+3]=color[3];
    }

    function draw(obj) {
        oc.width=obj.width;
        //oc.height=2*obj.height;
        canvas.drawImage(obj,0,0,obj.width, obj.height);
        var oImg=canvas.getImageData(0,0,obj.width, obj.height);
        var w=oImg.width;
        var h=oImg.height;
        var newImg=canvas.createImageData(w,h);
        //先循环列
        for(var i=0; i<h; i++) {
            //循环行
            for(var j=0; j<w; j++) {
                var result=[];
                var color=getXY(oImg, j, i);
                result[0]=255-color[0];
                result[1]=255-color[1];
                result[2]=255-color[2];
                result[3]=255*i/h;
                setXY(newImg, j,h-i, result);
            }
        }

        canvas.putImageData(newImg, 0, obj.height);
    }

};
</script>
</head>

<body>

<canvas id="canvas"></canvas>
</body>
</html>

canvas实现图片反色、渐变、倒影

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script>
window.onload=function(){
    var oc=document.getElementById(‘canvas‘);
    var canvas=oc.getContext(‘2d‘);
    var yImg=new Image();
    yImg.onload=function() {
        draw(this);
    };
    yImg.src=‘2.png‘;

    function getXY(obj, x, y){
        var arr=[];
        var w=obj.width;
        var h=obj.height;
        var d=obj.data;

        arr[0]=d[4*(y*w+x)];
        arr[1]=d[4*(y*w+x)+1];
        arr[2]=d[4*(y*w+x)+2];
        arr[3]=d[4*(y*w+x)+3];
        return arr;
    }

    function setXY(obj, x, y,color){
        var arr=[];
        var w=obj.width;
        var h=obj.height;
        var d=obj.data;

        d[4*(y*w+x)]=color[0];
        d[4*(y*w+x)+1]=color[1];
        d[4*(y*w+x)+2]=color[2];
        d[4*(y*w+x)+3]=color[3];
    }

    function draw(obj) {
        //num分块图片 w/num, h/num
        var num=10;
        oc.width=obj.width;
        //oc.height=2*obj.height;
        canvas.drawImage(obj,0,0,obj.width, obj.height);
        var oImg=canvas.getImageData(0,0,obj.width, obj.height);
        var w=oImg.width;
        var h=oImg.height;
        var newImg=canvas.createImageData(w,h);
        //具体分块
        var stepW=w/num;
        var stepH=h/num;
        for(var i=0; i<stepH; i++) {
            for(var j=0; j<stepW; j++) {
                //提取颜色
                var color=getXY(oImg, j*num+Math.floor(Math.random()*num),i*num+Math.floor(Math.random()*num));
                //根据num块循环，块是个二维数组（如如很多方格）
                for(var k=0; k<num; k++) {
                    for(var l=0; l<num; l++) {
                        setXY(newImg, j*num+l, i*num+k, color);
                    }
                }
            }
        }
        canvas.putImageData(newImg,0, obj.height);
    }

};
</script>
</head>

<body>

<canvas id="canvas"></canvas>
</body>
</html>

canvas实现图片马赛克

6、html5实现的播放器

属性：
controls  :   显示或隐藏用户控制界面
autoplay  :  媒体是否自动播放
loop  : 媒体是否循环播放
currentTime  :  开始到播放现在所用的时间
duration  :  媒体总时间(只读)
volume  :   0.0-1.0的音量相对值
muted  :   是否静音
autobuffer  :   开始的时候是否缓冲加载，autoplay的时候，忽略此属性
paused  :   媒体是否暂停(只读)
ended   :   媒体是否播放完毕(只读)
error   :  媒体发生错误的时候，返回错误代码 (只读)
currentSrc  :   以字符串的形式返回媒体地址(只读)
poster  :   视频播放前的预览图片
width、height  :   设置视频的尺寸
videoWidth、 videoHeight  :   视频的实际尺寸(只读)

方法：
play()  :  媒体播放
pause()  :  媒体暂停
load()  :  重新加载媒体
事件：
loadstart progress suspend emptied stalled play pause loadedmetadata loadeddata waiting playing canplay canplaythrough seeking seeked timeupdate ended ratechange durationchange volumechange

HTML5 viedo属性方法事件

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{ margin:0; padding:0;}
#div1{ width:300px; height:30px; background:#666; overflow:hidden; position:relative;}
#div2{ width:60px; height:30px; background:red; position:absolute; left:0; top:0;}

#div3{ width:300px; height:10px; background:#666; overflow:hidden; position:relative; top:10px;}
#div4{ width:60px; height:10px; background:yellow; position:absolute; left:240px; top:0;}

</style>
<script>

window.onload = function(){
    var oV = document.getElementById(‘v1‘);
    var aInput = document.getElementsByTagName(‘input‘);

    var oDiv1 = document.getElementById(‘div1‘);
    var oDiv2 = document.getElementById(‘div2‘);
    var oDiv3 = document.getElementById(‘div3‘);
    var oDiv4 = document.getElementById(‘div4‘);

    var disX = 0;
    var disX2 = 0;

    var timer = null;

    aInput[0].onclick = function(){

        if( oV.paused ){

            oV.play();

            this.value = ‘暂停‘;

            nowTime();
            timer = setInterval(nowTime,1000);

        }
        else{

            oV.pause();

            this.value = ‘播放‘;

            clearInterval(timer);

        }

    };

    aInput[2].value = changeTime(oV.duration);

    aInput[3].onclick = function(){

        if( oV.muted ){

            oV.volume = 1;

            this.value = ‘静音‘;

            oV.muted = false;

        }
        else{

            oV.volume = 0;

            this.value = ‘取消静音‘;

            oV.muted = true;

        }

    };

    aInput[4].onclick = function(){
        oV.mozRequestFullScreen();
    };

    function nowTime(){

        aInput[1].value = changeTime(oV.currentTime);

        var scale = oV.currentTime/oV.duration;

        oDiv2.style.left = scale * 240 + ‘px‘;

    }

    function changeTime(iNum){

        iNum = parseInt( iNum );

        var iH = toZero(Math.floor(iNum/3600));
        var iM = toZero(Math.floor(iNum%3600/60));
        var iS = toZero(Math.floor(iNum%60));

        return iH + ‘:‘ +iM + ‘:‘ + iS;

    }

    function toZero(num){
        if(num<=9){
            return ‘0‘ + num;
        }
        else{
            return ‘‘ + num;
        }
    }

    oDiv2.onmousedown = function(ev){
        var ev = ev || window.event;
        disX = ev.clientX - oDiv2.offsetLeft;

        document.onmousemove = function(ev){
            var ev = ev || window.event;

            var L = ev.clientX - disX;

            if(L<0){
                L = 0;
            }
            else if(L>oDiv1.offsetWidth - oDiv2.offsetWidth){
                L = oDiv1.offsetWidth - oDiv2.offsetWidth;
            }

            oDiv2.style.left = L + ‘px‘;

            var scale = L/(oDiv1.offsetWidth - oDiv2.offsetWidth);

            oV.currentTime = scale * oV.duration;

            nowTime();

        };
        document.onmouseup = function(){
            document.onmousemove = null;
        };
        return false;
    };

    oDiv4.onmousedown = function(ev){
        var ev = ev || window.event;
        disX2 = ev.clientX - oDiv4.offsetLeft;

        document.onmousemove = function(ev){
            var ev = ev || window.event;

            var L = ev.clientX - disX2;

            if(L<0){
                L = 0;
            }
            else if(L>oDiv3.offsetWidth - oDiv4.offsetWidth){
                L = oDiv3.offsetWidth - oDiv4.offsetWidth;
            }

            oDiv4.style.left = L + ‘px‘;

            var scale = L/(oDiv3.offsetWidth - oDiv4.offsetWidth);
            oV.volume = scale;

        };
        document.onmouseup = function(){
            document.onmousemove = null;
        };
        return false;
    };

};

</script>
</head>

<body>
<video id="v1">

    <source src="Intermission-Walk-in.ogv"></source>
    <source src="Intermission-Walk-in_512kb.mp4"></source>

</video><br />
<input type="button" value="播放" />
<input type="button" value="00:00:00" />
<input type="button" value="00:00:00" />
<input type="button" value="静音" />
<input type="button" value="全屏" />
<div id="div1">
    <div id="div2"></div>
</div>
<div id="div3">
    <div id="div4"></div>
</div>

</body>
</html>

HTML5播放器

7、地理位置、定位（后续）

时间： 2024-10-31 21:08:36

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