jquery学习记录

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.User{background-image:none}.User-icon{margin-right:4px;margin-left:12px;vertical-align:middle}.User-name{max-width:300px;vertical-align:top;overflow:hidden}.ie8 .User-name,.ie9 .User-name{width:auto}.User-nameText{overflow:hidden;-o-text-overflow:ellipsis;-webkit-text-overflow:ellipsis;text-overflow:ellipsis;white-space:nowrap;max-width:300px;width:100%;padding:6px 12px 6px 0;border-right:1px solid #18a269;display:inline;vertical-align:top}.Nav{list-style:none;padding-left:0;margin:0}.Nav-anchor{text-decoration:none;white-space:nowrap;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;display:block}.ie7 .Nav-anchor{zoom:1}.Nav-anchor:hover,.Nav-anchor:focus{text-decoration:none}.Nav_userNav-left{vertical-align:top;padding-left:1.84615385em;padding-left:2rem;padding-right:1.84615385em;padding-right:2rem;padding-bottom:3.07692308em;padding-bottom:3.33333333rem}@media all{.Nav_userNav-left{background:url(/redesign/global/img/header-dropdown-splitter.png) right top transparent scroll no-repeat;-webkit-background-size:24px 141px;-moz-background-size:24px 141px;-o-background-size:24px 141px;background-size:24px 141px}}@media all and (-moz-min-device-pixel-ratio:1.5),all and (-o-min-device-pixel-ratio:3/2),all and (-webkit-min-device-pixel-ratio:1.5),all and (min-device-pixel-ratio:1.5),all and (min-resolution:1.5dppx){html:not(.ie8) .Nav_userNav-left{background:url(/redesign/global/img/header-dropdown-splitter@2x.png) right top transparent scroll no-repeat;-webkit-background-size:24px 141px;-moz-background-size:24px 141px;-o-background-size:24px 141px;background-size:24px 141px}}.Nav_userNav-right{padding-left:1.46153846em;padding-left:1.58333333rem;padding-right:1.84615385em;padding-right:2rem;padding-bottom:3.07692308em;padding-bottom:3.33333333rem}.Nav_userNav-item{padding-top:.76923077em;padding-top:.83333333rem}.ie7 .Nav_userNav-item{zoom:1}.Nav_userNav-anchor-right .Nav_userNav-anchor{text-transform:uppercase}.Nav_userNav-anchor,.Nav_userNav-anchor:visited{color:#646e71;font-family:gotham,helvetica,arial,sans-serif;font-style:normal;font-weight:400;font-size:1.16666667em;font-size:1.16666667rem;line-height:2;padding:0 .61538462em;padding:0 .66666667rem;border-width:0;border-radius:1.92307692em;border-radius:2.08333333rem;-webkit-transition:all .1s ease-in;-moz-transition:all .1s ease-in;-ms-transition:all .1s ease-in;-o-transition:all .1s ease-in;transition:all .1s ease-in}:lang(zh-cn) .Nav_userNav-anchor,:lang(zh-cn) .Nav_userNav-anchor:visited{font-family:gotham,Hiragino Sans GB,STHeiti,Microsoft Yahei,helvetica,arial,sans-serif}.ie8 .Nav_userNav-anchor,.ie8 .Nav_userNav-anchor:visited{font-family:gotham-400-normal,helvetica,arial,sans-serif;font-style:normal;font-weight:400}.ie8 :lang(zh-cn) .Nav_userNav-anchor,.ie8 :lang(zh-cn) .Nav_userNav-anchor:visited{font-family:gotham-400-normal,Hiragino Sans GB,STHeiti,Microsoft 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.Banner-divider,.ie8 .Banner-divider{border-right:1px solid #2e8f25;border-left:1px solid #55bd49}.logo-bar .Banner-divider,.Banner-divider.short{height:23px;margin-top:13px}.header{background-color:#2dbe60;width:100%;height:48px;border-bottom:1px solid #259d4f}#header-wrapper .header,.wrapper-embed .header{display:block;height:32px}.ie8 .header{z-index:auto}.header-inner{height:48px}.header-inner:before,.header-inner:after{display:table;content:""}.header-inner:after{clear:both}.ie8 .header-inner{zoom:1}.header-inner .referral-promo:link,.header-inner .referral-promo:hover,.header-inner .referral-promo:active,.header-inner .referral-promo:visited{display:inline-block;font-family:gotham,helvetica,arial,sans-serif;font-style:normal;font-weight:700;font-size:12px;color:#fff;height:27px;line-height:1em;padding:5px 0 0;text-decoration:none}:lang(zh-cn) .header-inner .referral-promo:link,:lang(zh-cn) .header-inner .referral-promo:hover,:lang(zh-cn) .header-inner .referral-promo:active,:lang(zh-cn) .header-inner .referral-promo:visited{font-family:gotham,Hiragino Sans GB,STHeiti,Microsoft Yahei,helvetica,arial,sans-serif}.ie8 .header-inner .referral-promo:link,.ie8 .header-inner .referral-promo:hover,.ie8 .header-inner .referral-promo:active,.ie8 .header-inner .referral-promo:visited{font-family:gotham-700-normal,helvetica,arial,sans-serif;font-style:normal;font-weight:400}.ie8 :lang(zh-cn) .header-inner .referral-promo:link,.ie8 :lang(zh-cn) .header-inner .referral-promo:hover,.ie8 :lang(zh-cn) .header-inner .referral-promo:active,.ie8 :lang(zh-cn) .header-inner .referral-promo:visited{font-family:gotham-700-normal,Hiragino Sans GB,STHeiti,Microsoft Yahei,helvetica,arial,sans-serif}@media all{.header-inner .referral-promo:hover,.header-inner .referral-promo:active{background:url(/redesign/global/img/header-highlight.png) bottom transparent no-repeat;-webkit-background-size:100% 25px;-moz-background-size:100% 25px;-o-background-size:100% 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endColorstr=#CC213442);filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#CC213442, endColorstr=#CC213442)}.register #registration-footer{display:block;text-align:center;background-color:rgba(33,52,66,.8);padding-top:30px;padding-bottom:26px;border-top:1px solid #929ca3;position:fixed;bottom:0;width:100%}.register #registration-footer .text{font-size:20px;line-height:26px;font-family:Caecilia-italic,helvetica,arial,sans-serif;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.3);display:inline-block;-webkit-font-smoothing:antialiased;width:400px;text-align:left;margin-right:40px;vertical-align:middle}@media only screen and (max-width:709px){.register #registration-footer .text{width:84%;margin:6px 16px 12px}}.register #registration-footer .button{background-color:#5bab34;background-image:-moz-linear-gradient(top,#5fb336,#55a030);background-image:-ms-linear-gradient(top,#5fb336,#55a030);background-image:-webkit-gradient(linear,0 0,0 100%,from(#5fb336),to(#55a030));background-image:-webkit-linear-gradient(top,#5fb336,#55a030);background-image:-o-linear-gradient(top,#5fb336,#55a030);background-image:linear-gradient(top,#5fb336,#55a030);background-repeat:repeat-x;filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=‘#ff5fb336‘, endColorstr=‘#ff55a030‘, GradientType=0);border:1px solid #4f9e29;height:31px;font-family:helvetica,arial,sans-serif;font-size:18px;color:#fff;display:inline-block;-webkit-font-smoothing:antialiased;padding:11px 16px 0;width:150px;-webkit-border-radius:4px;-moz-border-radius:4px;border-radius:4px;text-align:center;cursor:pointer}@media only screen and (max-width:709px){.register #registration-footer .button{padding:11px 64px 0}}.register #registration-footer .close{height:13px;width:13px;position:absolute;top:16px;right:16px;cursor:pointer}@media all{.register #registration-footer .close{background:url(/redesign/sharing/SharedNoteViewAction/close.png) no-repeat;-webkit-background-size:13px 13px;-moz-background-size:13px 13px;-o-background-size:13px 13px;background-size:13px 13px}}@media all and (-moz-min-device-pixel-ratio:1.5),all and (-o-min-device-pixel-ratio:3/2),all and (-webkit-min-device-pixel-ratio:1.5),all and (min-device-pixel-ratio:1.5),all and (min-resolution:1.5dppx){html:not(.ie8) .register #registration-footer .close{background:url(/redesign/sharing/SharedNoteViewAction/close@2x.png) no-repeat;-webkit-background-size:13px 13px;-moz-background-size:13px 13px;-o-background-size:13px 13px;background-size:13px 13px}}.spam-dialog p{margin-bottom:1em}.spam-dialog p.last{margin-bottom:0}.spam-dialog p.anchor-url{font-weight:700;padding:0 1em}#loading-placeholder{height:150px;width:150px;margin:auto}@media all{#loading-placeholder{background:url(/redesign/global/img/loading-spinner.gif) no-repeat center;-webkit-background-size:150px 150px;-moz-background-size:150px 150px;-o-background-size:150px 150px;background-size:150px 150px}}@media all and (-moz-min-device-pixel-ratio:1.5),all and (-o-min-device-pixel-ratio:3/2),all and (-webkit-min-device-pixel-ratio:1.5),all and (min-device-pixel-ratio:1.5),all and (min-resolution:1.5dppx){html:not(.ie8) #loading-placeholder{background:url(/redesign/global/img/loading-spinner.gif) no-repeat center;-webkit-background-size:150px 150px;-moz-background-size:150px 150px;-o-background-size:150px 150px;background-size:150px 150px}}
-->

append的用法

//$(document).append是用来向元素内部的结尾处追加内容或标签的方法
// 如果是追加一个字符串来添加元素的话,就是追加元素,
// 如果追加的是现有元素的话,等同于移动
// 新增元素
var obj="<div>我是一个字符串</div>" ;
$ ("body"). append(obj );
//移动元素
var obj=$(".div1" )[0];
$ ("body"). append(obj );

.on

$(父级元素).on("event","需要绑定这个事件的元素",function(){});

使用on的时候也可以像bind那样使用，当然，也无法绑定未来生成的元素

$("doc").bind("event",function(){}); = $("doc").on("event",function(){});

.on的参数 events,[selector],[data],fn

selector:一个选择器字符串用于过滤器的触发事件的选择器元素的后代。如果选择的< null或省略，当它到达选定的元素，事件总是触发。

这种用法就是bind的用法

.live

$("需要绑定事件的元素").live("事件",function(){})

jquery1.9移除了toggle()事件,只剩下了toggle()方法;

如需使用,则需要使用此插件:

;(function ($ ) {
$.fn.extend({
toggle : function ( fn) {
// Save reference to arguments for access in closure
var args = arguments,
guid = fn.guid||jQuery.guid++ ,
i = 0,
toggler = function (event) {
// Figure out which function to execute
var lastToggle = (jQuery._data(this,"lastToggle" + fn.guid) || 0 ) % i;
jQuery._data(this ,"lastToggle" + fn.guid, lastToggle + 1);

// Make sure that clicks stop
event.preventDefault();

// and execute the function
return args[lastToggle].apply(this,arguments) || false;
};

// link all the functions, so any of them can unbind this click handler
toggler.guid = guid;
while (i < args.length) {
args[ i++].guid = guid ;
}

return this.click(toggler);
}
});
})(jQuery);

$.fn.extend和$.extend的用法以及区别

$.fn.extend为jQuery类添加类方法，可以理解为添加静态方法。

$.fn是指jquery的命名空间，加上fn上的方法及属性，会对jquery实例每一个有效。

以下写法是符合AMD规范的写法,以后添加的插件都要符合AMD规范

$.fn.extend:

;(function (factory ) {
if (typeof define === "function" && define. amd) {
// AMD模式
define (["jquery"], factory);
} else {
// 全局模式
factory (jQuery);
}
}(function ($) {
$.fn.maxHeight= function () {

var max = 0 ;

this.each( function () {
max = Math.max(max ,$( this).height());
});

return max;
};
}));

//调用方法

//这里是添加了jQuery对象方法,可以对jQuery的实例对象使用

var hei = $(".btn").maxHeight();
console.log( hei);

$.extend:

;( function (factory ) {
if (typeof define === "function" && define. amd) {
// AMD模式
define (["jquery"], factory);
} else {
// 全局模式
factory (jQuery);
}
}(function ($) {
$.extend({
_pomin:function (a,b) {
return a < b ? a : b
},
_pomax:function (a,b) {
return a > b ? a : b
}
})
}));

//调用方法

//jQuery在调用的时候可以根据的你的参数写成其它的,比如$

//这里是添加了jQuery静态方法,注意不要和jQuery现有方法重名

jQuery._pomin( -5, 10);

jQuery._pomax( -55, -70);

jquery Hammer用法

<!doctype html>
<html>
<head>
<title >hammer jq</ title>
<script type="text/javascript" src="jquery-2.1.1.min.js"></script >
<script type="text/javascript" src="hammer.min.js" ></script>
<script type="text/javascript" src="jquery.hammer.js"></script >
<script type="text/javascript">
$ (function(){
$ (".ham").hammer().bind("tap", function(){
alert( "tap");
});
})
</ script>
</head >
<body style="width :300px ;height: 300px; ">
<div class="ham" style="width :50px ;height: 50px; background:#0ff ;"></ div>
</body >
</html >

jquery.hammer.zip
35.9 KB

//wrap是给每个匹配的元素包裹元素
//wrapAll是给匹配的元素的最上级包裹元素
//给body的每一个子元素包裹一层id=mask的div

$("body").children().wrap("<div id=\"mask\"></div>");
//给body加一个id=mask的div,使其包裹div下所有的元素
$("body").children().wrapAll("<div id=\"mask\"></div>");

//这里是可以用find()的,用children()是为了少选择一些元素,减少一些不必要的遍历

jquery1.6引入了prop;

对于prop和attr的使用情况有些不清楚,特记录:

对于dom元素自有属性使用prop来操作,对于自定义属性使用attr来操作,

attr操作复选框元素的选中属性时,如果使用attr,第一次选中是正常的,

第二次选中虽然选中了,但是没有打勾的样式,使用prop正常;

prop使用prop可以设置自定义属性,但是第一次获取自定义属性的时候返回值为undefined;

prop不可以操作onclick 而使用attr是可以的 所以以上所述不是很合理 //遇到了再继续研究

以下是官方建议attr(),prop()的使用：

通过监视键盘的按键来执行一些事件,比如,回车键登陆这个就很常见;

$(window).keydown(function(e){//这个是用来回车键登陆的

var code=e.keyCode;

if(code==13){

alert("clickEnter")

}else{

//按了按键但不是回车键

}

});

这次绑定的是window对象,当然也可以绑定其他事件;通常,可以绑定事件的

只能是文本域,因为必须获取焦点才可以响应keydown事件,如果非要给div加

这个事件的话也是可以的,给div加一个tabindex="1"即可,不过不建议这样做,

因为会出现很难看的边框,当然边框还是可以去掉的outline:none,即可;

绑定keydown的时候,还是建议绑定过需要执行事件的文本域比较合适;

jquery hover mouseover+mouseout mouseenter+mouseleave

hover=mouseenter+mouseleave

mouseenter 只有鼠标进入被选元素才会触发;

mouseover 当鼠标进入被选元素以及被选元素的子元素是都会触发;

通常会使用mouseenter+mouseleave来做鼠标移动事件;