JS配合CSS实现的漂亮渐变背景特效6个实例

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JS配合CSS实现的漂亮渐变背景特效6个实例

作者:admin 发布时间:2011-8-1 20:18:27 发布人: admin

<html>
<head>
<title>JS配合CSS实现的漂亮渐变背景特效6个实例</title>
<script>
var setGradient = (function(){
 var p_dCanvas = document.createElement('canvas');
 var p_useCanvas =  !!( typeof(p_dCanvas.getContext) == 'function');
 var p_dCtx = p_useCanvas?p_dCanvas.getContext('2d'):null;
 var p_isIE = /*@cc_on!@*/false;
   try{   p_dCtx.canvas.toDataURL() }catch(err){
          p_useCanvas = false ;
   };
         
 if(p_useCanvas){
    return function (dEl , sColor1 , sColor2 , bRepeatY ){
   if(typeof(dEl) == 'string') dEl =  document.getElementById(dEl);
   if(!dEl) return false;
   var nW = dEl.offsetWidth;
   var nH = dEl.offsetHeight;
   p_dCanvas.width = nW;
   p_dCanvas.height = nH;
   var dGradient;
   var sRepeat;
   if(bRepeatY){
    dGradient = p_dCtx.createLinearGradient(0,0,nW,0);
    sRepeat = 'repeat-y';
   }else{
    dGradient = p_dCtx.createLinearGradient(0,0,0,nH);
    sRepeat = 'repeat-x';
   }  
   
   dGradient.addColorStop(0,sColor1);
   dGradient.addColorStop(1,sColor2);    
   
   p_dCtx.fillStyle = dGradient ; 
   p_dCtx.fillRect(0,0,nW,nH);
   var sDataUrl = p_dCtx.canvas.toDataURL('image/png');
   
   with(dEl.style){
    backgroundRepeat = sRepeat;
    backgroundImage = 'url(' + sDataUrl + ')';
    backgroundColor = sColor2;    
   };
    }
 }else if(p_isIE){
  
  p_dCanvas = p_useCanvas = p_dCtx =  null;  
  return function (dEl , sColor1 , sColor2 , bRepeatY){
   if(typeof(dEl) == 'string') dEl =  document.getElementById(dEl);
   if(!dEl) return false;
   dEl.style.zoom = 1;
   var sF = dEl.currentStyle.filter;
   dEl.style.filter += ' ' + ['progid:DXImageTransform.Microsoft.gradient( GradientType=',  +(!!bRepeatY ),',enabled=true,startColorstr=',sColor1,', endColorstr=',sColor2,')'].join('');
 };
 
 }else{
  p_dCanvas = p_useCanvas = p_dCtx =  null;
  return function(dEl , sColor1 , sColor2  ){
   
   if(typeof(dEl) == 'string') dEl =  document.getElementById(dEl);
   if(!dEl) return false;
   with(dEl.style){
    backgroundColor = sColor2; 
   };
  }
 }
})();
 </script>
<style>
  body{font:0.75em/1.4 Arial;text-align:left;margin:20px;}
  hr{clear:both;visibility:hidden;}
  xmp{font:12px/12px "Courier New";background:#fff;color:#666; border:solid 1px #ccc;}
  div.example{  border:solid 1px #555;margin:0 20px 20px 0;float:left; display:inline;margin:1em;background:#fff;width:300px;padding:40px;color:#222;font:xx-small/1.2 "Tahoma";text-align:justify;}
</style>
<body>
<div id="example1" class="example">CSS特效代码。</div>
  <div id="example2" class="example">各类编程源码、 </div>
  <div id="example3" class="example">精品软件</div>
  <div id="example4" class="example">上海世博园 </div>
  <div id="example5" class="example">我家北京天安门</div>
  <div id="example6" class="example">北京欢迎您！</div>
<script>
setGradient('example1','#4ddbbe','#d449cc',1);
setGradient('example2','#46ddbd','#d8b617',0);
setGradient('example3','#c81fc1','#bf445f',1);
setGradient('example4','#2285e5','#d769eb',0);
setGradient('example5','#8b4286','#eac87d',1);
setGradient('example6','black','white',0);
</script>
</body>
</html>

JS配合CSS实现的漂亮渐变背景特效6个实例

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