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JS+CSS实现的漂亮渐变背景特效代码(6个渐变效果)

时间:2024-3-2 01:58     作者:韩俊     分类: Html+Css


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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标签: html css

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