JS和CSS实现渐变背景特效的代码

2020-11-27 来源：汇智旅游网

这篇文章主要介绍了JS和CSS实现的漂亮渐变背景特效代码,包含6个渐变效果,涉及JavaScript针对页面元素属性动态操作的相关技巧,需要的朋友可以参考下

本文实例讲述了JS+CSS实现的漂亮渐变背景特效代码。分享给大家供大家参考，具体如下：

运行效果截图如下：

具体代码如下：

<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;} p.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>
 <p id="example1" class="example">
 CSS特效代码。
 </p>
 <p id="example2" class="example">
 各类编程源码、
 </p>
 <p id="example3" class="example">
 精品软件
 </p>
 <p id="example4" class="example">
 上海世博园
 </p>
 <p id="example5" class="example">
 我家北京天安门
 </p>
 <p id="example6" class="example">
 北京欢迎您！
 </p>
 <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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JS和CSS实现渐变背景特效的代码