<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="智能社 - zhinengshe.com" />
<meta name="copyright" content="智能社 - zhinengshe.com" />
<title>智能社 - www.zhinengshe.com</title>
<style>
*{margin:0;padding:0;list-style:none;}
#div1{ position:absolute;left:0;top:0;width:200px; height:200px; background:red;}
</style>
<script>
window.onload = function(){
var oDiv = document.getElementById("div1");
var bLeft = bTop = bRight = bBottom = false;
var step = 10;
var bDarg = false;
var json = {width:oDiv.offsetWidth + "px",height:"200px",left:0,top:0,background:"red"};
function initDiv(json){
for(var name in json){
oDiv.style[name] = json[name];//?
}
}
document.onkeydown = function(ev){
var oEvent = ev || event;
var keyCode = oEvent.keyCode;
switch(keyCode){
case 37:
bLeft = true;
break;
case 38:
bTop = true;
break;
case 39:
bRight = true;
break;
case 40:
bBottom = true;
break;
}
//ctrl + Q 控制是否可以拖拽
if(oEvent.ctrlKey && keyCode == 81){
bDarg = !bDarg;
if(bDarg){
drag();
} else {
noDrag();
}
}
//ctrl + 上 中心点放大
if(oEvent.ctrlKey && keyCode == 38){
bTop = false;
oDiv.style.width = oDiv.offsetWidth + step + "px";
oDiv.style.height = oDiv.offsetHeight + step + "px";
oDiv.style.left = oDiv.offsetLeft - step/2 + "px";
oDiv.style.top = oDiv.offsetTop - step/2 + "px";
}
//ctrl + 下 中心点缩小
if(oEvent.ctrlKey && keyCode == 40){
bBottom = false;
oDiv.style.width = oDiv.offsetWidth - step + "px";
oDiv.style.height = oDiv.offsetHeight - step + "px";
oDiv.style.left = oDiv.offsetLeft + step/2 + "px";
oDiv.style.top = oDiv.offsetTop + step/2 + "px";
}
//ctrl + 回车 还原到左上角
if(oEvent.ctrlKey && keyCode == 13){
//oDiv.style.cssText = " position:absolute;left:0;top:0;width:200px; height:200px; background:red;";
initDiv(json);
}
};
document.onkeyup = function(ev){
var oEvent = ev || event;
var keyCode = oEvent.keyCode;
switch(keyCode){
case 37:
bLeft = false;
break;
case 38:
bTop = false;
break;
case 39:
bRight = false;
break;
case 40:
bBottom = false;
break;
}
};
setInterval(function(){
if(bLeft){
oDiv.style.left = oDiv.offsetLeft - step + "px";
}
if(bTop){
oDiv.style.top = oDiv.offsetTop - step + "px";
}
if(bRight){
oDiv.style.left = oDiv.offsetLeft + step + "px";
}
if(bBottom){
oDiv.style.top = oDiv.offsetTop + step + "px";
}
},30);
function noDrag(){
oDiv.onmousedown = null;
}
function drag(){
oDiv.onmousedown = function(ev){
var oEvent = ev || event;
var disX = oEvent.clientX - oDiv.offsetLeft;
var disY = oEvent.clientY - oDiv.offsetTop;
document.onmousemove = function(ev){
var oEvent = ev || event;
var l=oEvent.clientX-disX;
var t=oEvent.clientY-disY;
if(l<0){
l=0;
}else if(l > document.documentElement.clientWidth - oDiv.offsetWidth) {
l = document.documentElement.clientWidth - oDiv.offsetWidth;
}
if(t<0){
t=0;
} else if(t > document.documentElement.clientHeight - oDiv.offsetHeight) {
t = document.documentElement.clientHeight - oDiv.offsetHeight;
}
oDiv.style.left = l + "px";
oDiv.style.top = t + "px";
};
document.onmouseup = function(){
document.onmousemove = null;
document.onmouseup = null;
oDiv.releaseCapture && oDiv.releaseCapture(); //释放捕获
};
//捕获 解决IE浏览器下拖拽图片的bug，即图片拖拽过程中不跟随鼠标移动直接到达鼠标目标点
oDiv.setCapture && oDiv.setCapture();
return false;
};
}
};
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>
时间： 2024-10-31 17:24:24