【求助】JavaScript如何让PNG图片在IE6下面透明

wmkandyk12359 2012-04-03 02:46:43

请问下JavaScript如何让PNG图片在IE6下面透明，找过一个CSS的方法，但是可惜只能是指定的图片才会透明，并且支持FF和高版本的IE有点问题！所以就不打算用CSS的了！

哪位朋友有在用的代码请共享一下，并且告诉一下如何调用，在此先谢谢各位了！

补充一下，我在网上找了个“轮播器”代码，要把按钮改成圆形的，想用图片来实现，用GIF不是很现实，希望代码也不会影响到轮播器的JS就好了，麻烦各位了！小弟先谢过

轮播器HTML：



<!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>JavaScript ShowImages</title>

<link href="css/my.css" rel="stylesheet" type="text/css" />

<script src="js/my.js" type="text/javascript"></script>

</head>

<body>

<div class="container" id="idTransformView">

  <ul class="slider" id="idSlider">

    <li><img src="images/01.jpg"/></li>

    <li><img src="images/02.jpg"/></li>

    <li><img src="images/03.jpg"/></li>

    <li><img src="images/04.jpg"/></li>

  </ul>

  <ul class="num" id="idNum">

    <li>1</li>

    <li>2</li>

    <li>3</li>

    <li>4</li>

  </ul>

</div>



</body>

</html>

轮播器CSS:



@charset "utf-8";

.container, .container *{margin:0; padding:0;}



.container{width:510px; height:240px; overflow:hidden;position:relative;}



.slider{position:absolute;}

.slider li{ list-style:none;display:inline;}

.slider img{ width:510px; height:240px; display:block;}







.num{ position:absolute; right:5px; bottom:5px;}

.num li{

	float: left;

	color: #FF7300;

	text-align: center;

	line-height: 30px;

	width: 30px;

	height: 30px;

	font-family: Arial;

	font-size: 12px;

	cursor: pointer;

	overflow: hidden;  /**/

	margin: 3px 1px;

    background-image:url(../images/round1.png);

}

.num li.on{ /*ť*/

	color: #fff;

	line-height: 30px;

	width: 30px;

	height: 30px;

	font-size: 16px;

	margin: 0 1px;

	border: 0;

	background-image:url(../images/round1.png);

	font-weight: bold;

}

轮播器JS：



var $ = function (id) {

	return "string" == typeof id ? document.getElementById(id) : id;

};



var Class = {

  create: function() {

	return function() {

	  this.initialize.apply(this, arguments);

	}

  }

}



Object.extend = function(destination, source) {

	for (var property in source) {

		destination[property] = source[property];

	}

	return destination;

}



var TransformView = Class.create();

TransformView.prototype = {

  

  initialize: function(container, slider, parameter, count, options) {

	if(parameter <= 0 || count <= 0) return;

	var oContainer = $(container), oSlider = $(slider), oThis = this;



	this.Index = 0;

	

	this._timer = null;

	this._slider = oSlider;

	this._parameter = parameter;

	this._count = count || 0;

	this._target = 0;

	

	this.SetOptions(options);

	

	this.Up = !!this.options.Up;

	this.Step = Math.abs(this.options.Step);

	this.Time = Math.abs(this.options.Time);

	this.Auto = !!this.options.Auto;

	this.Pause = Math.abs(this.options.Pause);

	this.onStart = this.options.onStart;

	this.onFinish = this.options.onFinish;

	

	oContainer.style.overflow = "hidden";

	oContainer.style.position = "relative";

	

	oSlider.style.position = "absolute";

	oSlider.style.top = oSlider.style.left = 0;

  },



  SetOptions: function(options) {

	this.options = {

		Up:			true,

		Step:		5,

		Time:		10,

		Auto:		true,

		Pause:		2000,

		onStart:	function(){},

		onFinish:	function(){}

	};

	Object.extend(this.options, options || {});

  },

  //start

  Start: function() {

	if(this.Index < 0){

		this.Index = this._count - 1;

	} else if (this.Index >= this._count){ this.Index = 0; }

	

	this._target = -1 * this._parameter * this.Index;

	this.onStart();

	this.Move();

  },

  //move

  Move: function() {

	clearTimeout(this._timer);

	var oThis = this, style = this.Up ? "top" : "left", iNow = parseInt(this._slider.style[style]) || 0, iStep = this.GetStep(this._target, iNow);

	

	if (iStep != 0) {

		this._slider.style[style] = (iNow + iStep) + "px";

		this._timer = setTimeout(function(){ oThis.Move(); }, this.Time);

	} else {

		this._slider.style[style] = this._target + "px";

		this.onFinish();

		if (this.Auto) { this._timer = setTimeout(function(){ oThis.Index++; oThis.Start(); }, this.Pause); }

	}

  },

  //length

  GetStep: function(iTarget, iNow) {

	var iStep = (iTarget - iNow) / this.Step;

	if (iStep == 0) return 0;

	if (Math.abs(iStep) < 1) return (iStep > 0 ? 1 : -1);

	return iStep;

  },

  //stop

  Stop: function(iTarget, iNow) {

	clearTimeout(this._timer);

	this._slider.style[this.Up ? "top" : "left"] = this._target + "px";

  }

};



window.onload=function(){

	function Each(list, fun){

		for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }

	};

	

	var objs = $("idNum").getElementsByTagName("li");

	

	var tv = new TransformView("idTransformView", "idSlider", 240, 4, {

		onStart : function(){ Each(objs, function(o, i){ o.className = tv.Index == i ? "on" : ""; }) }//Button Style

	});

	

	tv.Start();

	

	Each(objs, function(o, i){

		o.onmouseover = function(){

			o.className = "on";

			tv.Auto = false;

			tv.Index = i;

			tv.Start();

		}

		o.onmouseout = function(){

			o.className = "";

			tv.Auto = true;

			tv.Start();

		}

	})

	

	////////////////////////test2

	

	var objs2 = $("idNum2").getElementsByTagName("li");

	

	var tv2 = new TransformView("idTransformView2", "idSlider2", 408, 3, {

		onStart: function(){ Each(objs2, function(o, i){ o.className = tv2.Index == i ? "on" : ""; }) },//Button Style

		Up: false

	});

	

	tv2.Start();

	

	Each(objs2, function(o, i){

		o.onmouseover = function(){

			o.className = "on";

			tv2.Auto = false;

			tv2.Index = i;

			tv2.Start();

		}

		o.onmouseout = function(){

			o.className = "";

			tv2.Auto = true;

			tv2.Start();

		}

	})

	

	

}