如何用js实现div的背景颜色渐变？求解答
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这是我以前收藏的代码，利用CSS+JS实现渐变，代码如下：
<!doctype html public '-//w3c//dtd html 4.01//en' 'http://www.w3.org/tr/html4/strict.dtd'>
<html>
<head>
<meta http-equiv=content-type content="text/html; charset=gbk">
<title>渐变背景</title>
<script>
var setGradient = (function(){
//private variables;
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;
//test if toDataURL() is supported by Canvas since Safari may not support it
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;
// Create gradients
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;
};
//alert('your browser does not support gradient effet');
}
}
})();
</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>
<h1>渐变背景-beta1</h1>
<div id="example1" class="example">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aliquam blandit nunc lobortis diam bibendum semper. Nunc aliquam aliquam mi. Maecenas porttitor, lorem sed mattis ultrices, lorem risus consequat mi, vitae ullamcorper leo ipsum in tellus. Pellentesque arcu est, sollicitudin sed, ultricies quis, vestibulum a, neque. Duis massa elit, gravida vel, lacinia eu, pretium eget, ipsum. Etiam magna urna, ultrices ut, eu </div>
<div id="example2" class="example">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aliquam blandit nunc lobortis diam bibendum semper. Nunc aliquam aliquam mi. Maecenas porttitor, lorem sed mattis ultrices, lorem risus consequat mi, vitae ullamcorper leo ipsum in tellus. Pellentesque arcu est, sollicitudin sed, ultricies quis, vestibulum a, neque. Duis massa elit, gravida vel, lacinia eu, pretiu </div>
<div id="example3" class="example">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aliquam blandit nunc lobortis diam bibendum semper. Nunc aliquam aliquam mi. Maecenas porttitor, lorem sed mattis ultrices, lorem risus consequat mi, vitae ullamcorper leo ipsum in tellus. Pellentesque arcu est, sollicitudin sed, ultricies quis, vestibulum a, neque. Duis massa elit, gravida vel, lacinia eu, pretium eget, ipsum. Etiam magna urna </div>
<div id="example4" class="example">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aliquam blandit nunc lobortis diam bibendum semper. Nunc aliquam aliquam mi. Maecenas porttitor, lorem sed mattis ultrices, lorem risus consequat mi, vitae ullamcorper leo ipsum in tellus. Pellentesque arcu est, sollicitudin sed, ultricies quis, vestibulum a, neque. Duis massa elit, gravida vel, lacinia eu, pretium eget, ipsum. Etiam magna urna, ultrices ut, euismod in, lobortis tempus, ipsum. Fusce risus tellus, interdum sit amet, </div>
<div id="example5" class="example">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aliquam blandit nunc lobortis diam bibendum semper. Nunc aliquam aliquam mi. Maecenas porttitor, lorem sed mattis ultrices, lorem risus consequat mi, vitae ullamcorper leo ipsum in tellus. Pellentesque arcu est, sollicitudin sed, ultricies quis, vestibulum a, neque. Duis massa elit, gravida vel, lacinia eu, pretium eget, ipsum. Etiam magna urna, ultrices ut, euismod in, lobortis tempus, ipsum. Fusce risus tellus, interd </div>
<div id="example6" class="example">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aliquam blandit nunc lobortis diam bibendum semper. Nunc aliquam aliquam mi. Maecenas porttitor, lorem sed mattis ultrices, lorem risus consequat mi, vitae ullamcorper leo ipsum in tellus. Pellentesque arcu est, sollicitudin sed, ultricies quis, vestibulum a, neque. Duis massa elit, gravida vel, lacinia eu, pretium eget, ipsum. Etiam magna urna, ultrices ut, euismod in, lobortis tempus, ipsum. Fusce risus tellus, interd </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>
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