js通过八个点拖动改变div大小的实现方法

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Resize</title>
<style type="text/css">
#rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{
position:absolute;background:#C00;width:6px;height:6px;z-index:5;font-size:0;}
#rLeftDown,#rRightUp{cursor:ne-resize;}
#rRightDown,#rLeftUp{cursor:nw-resize;}
#rRight,#rLeft{cursor:e-resize;}
#rUp,#rDown{cursor:n-resize;}
#rRightDown{ bottom:-3px; right:-3px;}
#rLeftDown{ bottom:-3px; left:-3px;}
#rRightUp{ top:-3px; right:-3px;}
#rLeftUp{ top:-3px; left:-3px;}
#rRight{ right:-3px; top:50%}
#rLeft{ left:-3px; top:50%}
#rUp{ top:-3px; left:50%}
#rDown{ bottom:-3px; left:50%}
</style>
</head>
<body>
<div id='ss' style="height:100px; width:100px; border:1px solid #000000; position:absolute; left:200px; top:200px;" >
<div id="rRightDown"> </div>
<div id="rLeftDown"> </div>
<div id="rRightUp"> </div>
<div id="rLeftUp"> </div>
<div id="rRight"> </div>
<div id="rLeft"> </div>
<div id="rUp"> </div>
<div id="rDown"></div>
</div>
<script>
var Sys = (function(ua){
    var s = {};
    s.IE = ua.match(/msie ([\d.]+)/)?true:false;
    s.Firefox = ua.match(/firefox\/([\d.]+)/)?true:false;
    s.Chrome = ua.match(/chrome\/([\d.]+)/)?true:false;
    s.IE6 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6))?true:false;
    s.IE7 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 7))?true:false;
    s.IE8 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 8))?true:false;
    return s;
})(navigator.userAgent.toLowerCase());

var $ = function (id) {
return document.getElementById(id);
};

var Css = function(e,o){
for(var i in o)
e.style[i] = o[i];
};

var Extend = function(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
};

var Bind = function(object, fun) {
    var args = Array.prototype.slice.call(arguments).slice(2);
    return function() {
        return fun.apply(object, args);
    }
};

var BindAsEventListener = function(object, fun) {
    var args = Array.prototype.slice.call(arguments).slice(2);
    return function(event) {
        return fun.apply(object, [event || window.event].concat(args));
    }
};

var CurrentStyle = function(element){
return element.currentStyle || document.defaultView.getComputedStyle(element, null);
};

function addListener(element,e,fn){
element.addEventListener?element.addEventListener(e,fn,false):element.attachEvent("on" + e,fn);
};
function removeListener(element,e,fn){
element.removeEventListener?element.removeEventListener(e,fn,false):element.detachEvent("on" + e,fn)
};

var Class = function(properties){
    var _class = function(){return (arguments[0] !== null && this.initialize && typeof(this.initialize) == 'function') ? this.initialize.apply(this, arguments) : this;};
    _class.prototype = properties;
    return _class;
};

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js通过八个点 拖动改变div大小的实现方法

js通过八个点拖动改变div大小的实现方法