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锁定老帖子 主题：javascript 图片渐显
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发表时间：2008-12-25
<!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=utf-8" />
<title>javascript 图片渐显</title>
<script type="text/javascript">
var Erit;
window["undefined"]=window["undefined"];
if (!Erit) {
Erit = {};
} else if (typeof Erit != "object") {
throw new Error("This namespace has been registered.");
} else if (Erit.newClass) {
throw new Error("The newClass has been created.");
}
Erit.gradualStep = function(){};
Erit.addEvent = function(obj, evt, fn){
if(obj.addEventListener) {
obj.addEventListener(evt, fn, false);
}
else if(obj.attachEvent) {
obj.attachEvent('on'+evt, fn);
}
};
Erit.gradualStep.prototype = {
isIE:(navigator.appName == "Microsoft Internet Explorer") ? true : false,
dom:null,
el:null,
init: function (el) {
this.el = el;
this.start();
},
get: function (el) {
var _d = document.getElementById(el);
return _d;
},
start: function(){
this.dom = this.get(this.el);
var _dom = this.dom;
var _isIE = this.isIE;
if (_dom.style.display == " ") {
this.firstOpacity = 1;
}
else {
if (_isIE) {
_dom.style.cssText="filter: alpha(opacity=0);";
_dom.filters.alpha.opacity = 0;
}
else {
_dom.style.opacity = 0;
}
var _firstStep = (_isIE) ? 100 : 120;
var _firstAlpha = (_isIE) ? 5 : 0.05;
var _firstOpacity = 0;
(function (){
if (_isIE) {
if (_dom.filters.alpha.opacity < 100) {
setTimeout(arguments.callee, _firstStep);
}
_dom.filters.alpha.opacity += _firstAlpha;
}
else {
if (_firstOpacity < 1) {
setTimeout(arguments.callee, _firstStep);
}
_firstOpacity += _firstAlpha;
_dom.style.opacity = _firstOpacity;
}
_dom.style.display = "";
})();
}
}
};
Erit.addEvent(window,"load",function (){
new Erit.gradualStep().init("img1");
});
</script>
</head>
<body>
<div><img id="img1" alt="test" src="meiying_02.gif" border="0" style="display:none;"/></div>
</body>
</html>
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