javascript 图片渐显 -

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javascript 图片渐显

JavaScript prototype Microsoft XHTML 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=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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