js realizes the uniform fade-in and fade-out of pictures-JS Tutorial-php.cn

js realizes the uniform fade-in and fade-out of pictures

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Release： 2018-04-19 09:15:25

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This time I will bring you js implementationPicturesFade in and out at a uniform speed, js realizes the picture fade in and out at a uniform speedWhat are the precautionsThe following is a practical case, let’s come together take a look.

<!DOCTYPE html>
<htmllang="en">
<head>
  <metacharset="UTF-8">
  <title>淡入效果</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    p {
      border: 2px solid #aaa;
    }
    img {
      width: 300px;
      height: 300px;
      filter: alpha(opacity:30);
      opacity: .3;
      margin: 0 auto;
    }
  </style>
</head>
<body>
<p>
  <imgsrc="img/timg.jpg"alt=""id="img">
</p>
<script>
  var alpha=30;
  var img = document.getElementById("img");
  img.onmouseover=function(){
    startMove(100)
  };
  img.onmouseout=function(){
    startMove(30)
  }
  var timer;
  function startMove(tar) {
    var img = document.getElementById("img");
    clearInterval(timer);
    timer = setInterval(function () {
      var ispeed=0;
      ispeed= alpha<tar?5:-5;
      if(alpha==tar){
        clearInterval(timer)
      }
      else{
        alpha+=ispeed;
        img.style.filter="alpha(opacity:"+alpha+")";
        img.style.opacity=alpha/100;
      }
    }, 30)
  }
</script>
</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!