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Code to implement gradient background effects using JS and CSS

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Jun 11, 2018 pm 03:27 PM

cssjsgradient background

This article mainly introduces the beautiful gradient background special effects code implemented by JS and CSS, including 6 gradient effects, involving JavaScript related skills for dynamic operation of page element attributes. Friends in need can refer to it

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(&#39;canvas&#39;);
        var p_useCanvas = !!(typeof(p_dCanvas.getContext) == &#39;function&#39;);
        var p_dCtx = p_useCanvas ? p_dCanvas.getContext(&#39;2d&#39;) : 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) == &#39;string&#39;) 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 = &#39;repeat-y&#39;;
            } else {
              dGradient = p_dCtx.createLinearGradient(0, 0, 0, nH);
              sRepeat = &#39;repeat-x&#39;;
            }
            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(&#39;image/png&#39;);
            with(dEl.style) {
              backgroundRepeat = sRepeat;
              backgroundImage = &#39;url(&#39; + sDataUrl + &#39;)&#39;;
              backgroundColor = sColor2;
            };
          }
        } else if (p_isIE) {
          p_dCanvas = p_useCanvas = p_dCtx = null;
          return function(dEl, sColor1, sColor2, bRepeatY) {
            if (typeof(dEl) == &#39;string&#39;) dEl = document.getElementById(dEl);
            if (!dEl) return false;
            dEl.style.zoom = 1;
            var sF = dEl.currentStyle.filter;
            dEl.style.filter += &#39; &#39; + [&#39;progid:DXImageTransform.Microsoft.gradient( GradientType=&#39;, +( !! bRepeatY), &#39;,enabled=true,startColorstr=&#39;, sColor1, &#39;, endColorstr=&#39;, sColor2, &#39;)&#39;].join(&#39;&#39;);
          };
        } else {
          p_dCanvas = p_useCanvas = p_dCtx = null;
          return function(dEl, sColor1, sColor2) {
            if (typeof(dEl) == &#39;string&#39;) 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(&#39;example1&#39;, &#39;#4ddbbe&#39;, &#39;#d449cc&#39;, 1);
        setGradient(&#39;example2&#39;, &#39;#46ddbd&#39;, &#39;#d8b617&#39;, 0);
        setGradient(&#39;example3&#39;, &#39;#c81fc1&#39;, &#39;#bf445f&#39;, 1);
        setGradient(&#39;example4&#39;, &#39;#2285e5&#39;, &#39;#d769eb&#39;, 0);
        setGradient(&#39;example5&#39;, &#39;#8b4286&#39;, &#39;#eac87d&#39;, 1);
        setGradient(&#39;example6&#39;, &#39;black&#39;, &#39;white&#39;, 0);
      </script>
    </body>
</html>

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