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javascript 线性渐变二

　　本文标签：javascript,线性渐变

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<title>javascript线性渐变 by 司徒正美</title> 
<meta charset="utf-8"/> 
<meta name="keywords" content="javascript线性渐变 by 司徒正美" /> 
<meta name="description" content="javascript线性渐变 by 司徒正美" /> 
<style type="text/css"> 
#gradient{ 
width:800px; 
height:200px; 
border:1px solid red; 
} 
</style> 
<script type="text/javascript"> 
//④使用IE滤镜实现渐变 
function setFilter(el,start,end,type){ 
el.style.filter = "progid:DXImageTransform.Microsoft.Gradient(enabled=true,startColorstr="+start+",GradientType="+type+", endColorstr="+end+")"; 
} 
//③每个渐变体的实现，是用table还是div 
function createStop(parent,top,left,width,height,type){ 
if(type){ 
var table = document.createElement("table"); 
parent.appendChild(table); 
var tr = table.insertRow(0), 
td = tr.insertCell(0) 
table.height = height+"px"; 
table.width = width+"px"; 
table.cellPadding = 0; 
table.cellSpacing = 0; 
table.style.cssText = "position:absolute;top:"+top+"px;left:"+left+"px" 
td.innerHTML =" "; 
return td; 
} 
var div = document.createElement("div"); 
parent.appendChild(div); 
div.style.height = height+"px"; 
div.style.width = width+"px"; 
return div; 
} 
//②渐变的具体实现，确定要使用多少渐变体，每个渐变体的颜色（是渐变色还是纯色）与长宽坐标 
var IEgradient = function(entity,stops,width,height,type){ 
var offset,color,beforeColor,stopWidth,stopHeight,left,top,stop; 
for(var i=0,j=0,l=stops.length;i<l;i++,j++){ 
offset = stops[i].split(",")[0]; 
color = stops[i].split(",")[1]; 
stopWidth = (offset/100 * width).toFixed(1); 
stopHeight = (offset/100 * height).toFixed(1); 
switch(i){ 
case 0 : 
beforeColor = color; 
left = stopWidth; 
top = stopHeight; 
if(offset != 0){ 
//插入一个纯色的table 
stop = type? createStop(entity,0,0,stopWidth,height,type) : 
createStop(entity,0,0,width,stopHeight,type); 
stop.style.backgroundColor = color; 
} 
break; 
case l-1: 
//先插入一个渐变的table 
var w2 = ((100-offset)/100 * width).toFixed(1), 
h2 = ((100-offset)/100 * height).toFixed(1), 
stop = type? createStop(entity,0,left,width - left -w2,height,type): 
createStop(entity,0,0,width,height - top -h2,type); 
setFilter(stop,beforeColor,color,type); 
if(offset != 100){ 
//再插入一个纯色的table 
var stop2 = type? createStop(entity,0,stopWidth,w2,height,type): 
createStop(entity,0,0,width,h2,type); 
stop2.style.backgroundColor = color; 
} 
break; 
default : 
//插入一个渐变的table 
stop = type ? createStop(entity,0,left,stopWidth - left,height,type) : 
createStop(entity,0,0,width,stopHeight-top,type); 
setFilter(stop,beforeColor,color,type); 
beforeColor = color; 
left = stopWidth; 
top = stopHeight; 
break; 
} 
} 
} 
//①渐变的主体函数 
var gradient = function(id){ 
var entity = document.getElementById(id), 
options = arguments[1] || {}, 
width = options.width, 
height = options.height, 
type = options.type , 
stops = options["color-stop"]; 
entity.style.position = "relative"; 
var content = entity.innerHTML; 
entity.innerHTML = ""; 
//向目标对象进行渐变 。 
IEgradient(entity,stops,width,height,type); 
//把原来的内容重新加入的目标对象 。 
var contentDiv = document.createElement("div"); 
contentDiv.style.cssText = "position:absolute;top:0;left:0"; 
contentDiv.innerHTML = content; 
entity.appendChild(contentDiv); 
} 
window.onload = function(){ 
gradient("gradient",{width:800,height:200,type:1,"color-stop":["0,red","16,orange","32,yellow","48,green","64,blue","80,indigo","100,violet"]}) 
} 
</script> 
<div id="gradient">javascript线性渐变 by 司徒正美 实现多重水平渐变效果</div> 
<p">必须在IE中才能看到效果！</P><br><INPUT onclick=runEx('runcode') type=button value=运行代码 /><br>
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