jQuery operates background color gradient animation effect-JS Tutorial-php.cn

jQuery operates background color gradient animation effect

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Release： 2018-04-19 16:28:59

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This time I will bring you the jQuery operation background color gradient animation effect. What are the precautions for jQuery operation background color gradient animation effect. The following is a practical case, let's take a look.

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>背景颜色渐变</title>
<script type="text/javascript" src="jquery-1.7.2.min.js"></script>
</head>
<body>
<input id="Button1" type="button" value="button" onclick="tggg()" />
<script>
  function tggg() {
    //$("#asd").css({ "background-color": "red" }).show().fadeOut(500);
    fadeColor(
    { r: 0, g: 255, b: 0 }, //star color
    {r: 255, g: 255, b: 255 }, //end color
    function (color) { document.getElementById("asd").style.backgroundColor = color; }, 1, 10);
  }
  //所有代码的执行时间只有24毫秒左右。
  function fadeColor(from, to, callback, duration, totalFrames) {
    //用一个函数来包裹setTimeout，根据帧数来确定延时
    function doTimeout(color, frame) {
      setTimeout(function () {
        try {
          callback(color);
        } catch (e) { JSLog.write(e); }
      }, (duration * 1000 / totalFrames) * frame);
      //总持续秒数/每秒帧数*当前帧数=延时(秒)，再乘以1000作为延时(毫秒)
    }
    // 整个渐变过程的持续时间，默认为1秒
    var duration = duration || 1;
    // 总帧数，默认为持续秒数*15帧，也即每秒15帧
    var totalFrames = totalFrames || duration * 15; var r, g, b; var frame = 1;
    //在第0帧设置起始颜色
    doTimeout('rgb(' + from.r + ',' + from.g + ',' + from.b + ')', 0);
    //计算每次变化所需要改变的rgb值
    while (frame < totalFrames + 1) {
      r = Math.ceil(from.r * ((totalFrames - frame) / totalFrames) + to.r * (frame / totalFrames));
      g = Math.ceil(from.g * ((totalFrames - frame) / totalFrames) + to.g * (frame / totalFrames));
      b = Math.ceil(from.b * ((totalFrames - frame) / totalFrames) + to.b * (frame / totalFrames));
      // 调用本frame的doTimeout
      doTimeout('rgb(' + r + ',' + g + ',' + b + ')', frame); frame++;
    }
  }
</script>
<p style="width: 600px; height: 200px; border: 1px solid red;" id="asd">
  脚本之家欢迎各位光临--http://www.jb51.net
</p>
</body>
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!