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Beautiful gradient background special effects code implemented by JS+CSS (6 gradient effects)_javascript skills

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2016-05-16 15:08:181832browse

The example in this article describes the beautiful gradient background special effects code implemented by JS+CSS. Share it with everyone for your reference, the details are as follows:

The screenshot of the running effect is as follows:

The specific code is as follows: 

<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 &#63; 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>

Readers who are interested in more JavaScript-related content can check out the special topics on this site: "Summary of JavaScript search algorithm techniques", "Summary of JavaScript animation special effects and techniques", "Summary of JavaScript errors and debugging techniques", "Summary of JavaScript data structures and algorithm techniques", "Summary of JavaScript traversal algorithms and techniques" and "JavaScript Mathematics Summary of operation usage》

I hope this article will be helpful to everyone in JavaScript programming.

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