图层自动伸缩、闪烁展示特效

2014-05-22 网页编程网 网页编程网

<SCRIPT>
function morph(e,wait,steps,style,done){
	if(e.morphing){
		return;
	}
	e.morphing = true;
	e.step = 0;
	e.done = steps;
	e.wait = wait;
	e.morphDone = done;
	// initialize the given element for the process
	// save some temporary variables within it
	var attribs = _eat_attrib(style);
	if(attribs["top"] != null){
		e.deltaTop = Math.round(Number((attribs["top"] - e.style.posTop) / steps));
		e.finalTop = attribs["top"];
	}else{
		e.deltaTop = null;
		e.finalTop = e.style.posTop;
	}
	if(attribs["left"] != null){
		e.deltaLeft = Math.round(Number((attribs["left"] - e.style.posLeft) / steps));
		e.finalLeft = attribs["left"];
	}else{
		e.deltaLeft = null;
		e.finalLeft = e.style.posLeft;
	}
	if(attribs["height"] != null){
		e.deltaHeight = Math.round(Number((attribs["height"] - e.style.posHeight) / steps));
		e.finalHeight = attribs["height"];
	}else{
		e.deltaHeight = null;
		e.finalHeight = e.style.posHeight;
	}
	if(attribs["width"] != null){
		e.deltaWidth = Math.round(Number((attribs["width"] - e.style.posWidth) / steps));
		e.finalWidth = attribs["width"];
	}else{
		e.deltaWidth = null;
		e.finalWidth = e.style.posWidth;
	}
	// group all of the coloring elements together
	e.colors = new Array();
	for(attrib in attribs){
		// check each one individually to kludge
		// if we need to use a "safe" name for the css attribute
		if(attrib == "background"){
				e.colors[e.colors.length] = new Array();
				e.colors[e.colors.length - 1].name = attrib;
				e.colors[e.colors.length - 1].safename = attrib;
		}
		if(attrib == "color"){
				e.colors[e.colors.length] = new Array();
				e.colors[e.colors.length - 1].name = attrib;
				e.colors[e.colors.length - 1].safename = attrib;
		}
		if(attrib == "border-color"){
				e.colors[e.colors.length] = new Array();
				e.colors[e.colors.length - 1].name = attrib;
				e.colors[e.colors.length - 1].safename = "borderColor";
		}
	}
	for(var i=0;i<e.colors.length;i++){
		var rgb = _eat_rgb(attribs[e.colors[i].name]);
		var prergb = _eat_rgb(e.style[e.colors[i].safename]);
		e.colors[i].delta = _eat_rgb(attribs[e.colors[i].name]);
		e.colors[i].finish = _eat_rgb(attribs[e.colors[i].name]);
		e.colors[i].delta["red"] = Math.round(Number((rgb["red"] - prergb["red"]) / steps));
		e.colors[i].delta["green"] = Math.round(Number((rgb["green"] - prergb["green"]) / steps));
		e.colors[i].delta["blue"] = Math.round(Number((rgb["blue"] - prergb["blue"]) / steps));
	}
	// fire the first morphing step
	setTimeout("_morphing(document.all." + e.id + ")", wait);
}
//// private function that does the work of morphing the element
function _morphing(e){
	e.step++;
	if(e.deltaTop!=null){
		e.style.posTop += e.deltaTop;
	}
	if(e.deltaLeft!=null){
		e.style.posLeft += e.deltaLeft;
	}
	if(e.deltaHeight!=null){
		e.style.posHeight += e.deltaHeight;
	}
	if(e.deltaWidth!=null){
		e.style.posWidth += e.deltaWidth;
	}
	for(var i=0;i<e.colors.length;i++){
		var rgb = _eat_rgb(e.style[e.colors[i].safename]);
		e.style[e.colors[i].safename] 	= "rgb("
						+ (e.colors[i].delta["red"] + rgb["red"])
						+ ","
						+ (e.colors[i].delta["green"] + rgb["green"])
						+ ","
						+ (e.colors[i].delta["blue"] + rgb["blue"])
						+ ")";
	}
	// do special things when we are done
	if(e.step == e.done){
		if(e.deltaTop != null)
			e.style.posTop = e.finalTop;
		if(e.deltaLeft != null)
			e.style.posLeft = e.finalLeft;
		if(e.deltaWidth != null)
			e.style.posWidth = e.finalWidth;
		if(e.deltaHeight != null)
			e.style.posHeight = e.finalHeight;
		for(var i=0;i<e.colors.length;i++){
			e.style[e.colors[i].safename] 	= "rgb("
							+ (e.colors[i].finish["red"] + rgb["red"])
							+ ","
							+ (e.colors[i].finish["green"] + rgb["green"])
							+ ","
							+ (e.colors[i].finish["blue"] + rgb["blue"])
							+ ")";
		}
		e.morphing = false;
		eval(e.morphDone);
	}else{
		setTimeout("_morphing(document.all." + e.id + ")", e.wait);
	}
	return;
}
//// util for element attribute parsing
//// returns an array of all of the keys = values
function _eat_attrib(str){
	var chunks = new Array();
	var all = new Array();
	chunks=str.split(";");
	for(var i=0;i<chunks.length;i++){
		var tmpA = new Array();
		tmpA=chunks[i].split(":");
		all[tmpA[0]]=tmpA[1];
	}
	return all;
}
//// util for style rgb(#,#,#) parsing
//// returns an array of red/green/blue = number
function _eat_rgb(str){
	var all = new Array();
	var a = str.indexOf("(");
	var b = str.indexOf(")");
	str = str.substring(a + 1, b);
	var tmpA = str.split(",");
	all["red"]=Number(tmpA[0]);
	all["green"]=Number(tmpA[1]);
	all["blue"]=Number(tmpA[2]);
	return all;
}
</SCRIPT>
<body>

<SPAN ID="test" STYLE="border:5px solid rgb(0,0,0);color:rgb(255,255,255);position:absolute;top:0;left:0;width:400;height:400;overflow:hidden;background:rgb(0,0,255)">
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</SPAN>
<SCRIPT>
function rander(){
	var top = Math.round(Math.random() * 400);
	var left = Math.round(Math.random() * 600);
	var width = Math.round(Math.random() * 200);
	var height = Math.round(Math.random() * 200);
	var r = Math.round(Math.random() * 255);
	var g = Math.round(Math.random() * 255);
	var b = Math.round(Math.random() * 255);
	var background = "rgb(" + r + "," + g + "," + b + ")";
	var r = Math.round(Math.random() * 255);
	var g = Math.round(Math.random() * 255);
	var b = Math.round(Math.random() * 255);
	var borderColor = "rgb(" + r + "," + g + "," + b + ")";
	var r = Math.round(Math.random() * 255);
	var g = Math.round(Math.random() * 255);
	var b = Math.round(Math.random() * 255);
	var color = "rgb(" + r + "," + g + "," + b + ")";
	morph(document.all.test,30,20,"top:" + top + ";left:" + left + ";width:" + width + ";height:" + height + ";background:" + background + ";border-color:" + borderColor + ";color:" + color + ";","rander();");
}
rander();
</SCRIPT>

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