js拖拉缩放效果-JS特效-爱易网页

js拖拉缩放效果

日期：2014-05-18　浏览次数：20109 次

以下是HTML网页特效代码，点击运行按钮可查看效果：

以下是程序代码

<!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=gb2312" />
<title>拖拉缩放效果</title>
</head>
<body>
<script>
var isIE = (document.all) ? true : false;
var $ = function (id) {
 return "string" == typeof id ? document.getElementById(id) : id;
};
var Class = {
 create: function() {
  return function() { this.initialize.apply(this, arguments); }
 }
}
var Extend = function(destination, source) {
 for (var property in source) {
  destination[property] = source[property];
 }
}
var Bind = function(object, fun) {
 return function() {
  return fun.apply(object, arguments);
 }
}
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 addEventHandler(oTarget, sEventType, fnHandler) {
 if (oTarget.addEventListener) {
  oTarget.addEventListener(sEventType, fnHandler, false);
 } else if (oTarget.attachEvent) {
  oTarget.attachEvent("on" + sEventType, fnHandler);
 } else {
  oTarget["on" + sEventType] = fnHandler;
 }
};
function removeEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.removeEventListener) {
        oTarget.removeEventListener(sEventType, fnHandler, false);
    } else if (oTarget.detachEvent) {
        oTarget.detachEvent("on" + sEventType, fnHandler);
    } else { 
        oTarget["on" + sEventType] = null;
    }
};
//缩放程序
var Resize = Class.create();
Resize.prototype = {
  //缩放对象
  initialize: function(obj, options) {
 this._obj = $(obj);//缩放对象
 
 this._styleWidth = this._styleHeight = this._styleLeft = this._styleTop = 0;//样式参数
 this._sideRight = this._sideDown = this._sideLeft = this._sideUp = 0;//坐标参数
 this._fixLeft = this._fixTop = 0;//定位参数
 this._scaleLeft = this._scaleTop = 0;//定位坐标
 
 this._mxSet = function(){};//范围设置程序
 this._mxRightWidth = this._mxDownHeight = this._mxUpHeight = this._mxLeftWidth = 0;//范围参数
 this._mxScaleWidth = this._mxScaleHeight = 0;//比例范围参数
 
 this._fun = function(){};//缩放执行程序
 
 //获取边框宽度
 var _style = CurrentStyle(this._obj);
 this._borderX = (parseInt(_style.borderLeftWidth) || 0) + (parseInt(_style.borderRightWidth) || 0);
 this._borderY = (parseInt(_style.borderTopWidth) || 0) + (parseInt(_style.borderBottomWidth) || 0);
 //事件对象(用于绑定移除事件)
 this._fR = BindAsEventListener(this, this.Resize);
 this._fS = Bind(this, this.Stop);
 
 this.SetOptions(options);
 //范围限制
 this.Max = !!this.options.Max;
 this._mxContainer = $(this.options.mxContainer) || null;
 this.mxLeft = Math.round(this.options.mxLeft);
 this.mxRight = Math.round(this.options.mxRight);
 this.mxTop = Math.round(this.options.mxTop);
 this.mxBottom = Math.round(this.options.mxBottom);
 //宽高限制
 this.Min = !!this.options.Min;
 this.minWidth = Math.round(this.options.minWidth);
 this.minHeight = Math.round(this.options.minHeight);
 //按比例缩放
 this.Scale = !!this.options.Scale;
 this.Ratio = Math.max(this.options.Ratio, 0);
 
 this.onResize = this.options.onResize;
 
 this._obj.style.position = "absolute";
 !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || (this._mxContainer.style.position</div></div>

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