JS+CSS实现的漂亮渐变背景特效代码(6个渐变效果)

2019-11-20 10:20:52

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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;} 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>

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