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JavaScript fade in and fade out simple example_javascript skills

WBOYOriginal: 2016-05-16 15:46:471332browse

The example in this article describes the implementation method of JavaScript fade-in and fade-out gradient. Share it with everyone for your reference. The details are as follows:

Here is an example of text gradient using JavaScript to fade in and out. Use js to control div tag elements to achieve gradient display and gradient hiding. As long as the content in that tag is faded in and out, the code is simple and easy to modify and improve. Front-end designer Essential web effects.

The operation effect is as shown below:

The specific code is as follows:

<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js代码控制元素简单的淡入淡出效果</title>
<style>
* {margin:0; padding:0}
body {font:12px Verdana,Arial; color:#777; background:#222}
a {color:#999; text-decoration:none}
a:hover {color:#bbb}
#wrapper {width:500px; margin:75px auto}
#buttons {height:35px}
.button {border:1px solid #eee; background:#ccc; border-radius:3px; -moz-border-radius:3px; padding:4px 0 5px; width:245px; text-align:center; cursor:pointer; float:left; color:#555}
.button:hover {border:1px solid #fff; background:#d9d9d9; color:#333}
.floatright {float:right}
#fade {opacity:0; filter:alpha(opacity='0') border-radius:3px; -moz-border-radius:3px; margin-bottom:10px; padding:9px 10px 0; height:26px; border:1px solid #548954; background:#355c33; color:#79af72; text-shadow:1px 1px #21341d}
</style>
<script type="text/javascript">
var fadeEffect=function(){
 return{
  init:function(id, flag, target){
   this.elem = document.getElementById(id);
   clearInterval(this.elem.si);
   this.target = target &#63; target : flag &#63; 100 : 0;
   this.flag = flag || -1;
   this.alpha = this.elem.style.opacity &#63; parseFloat(this.elem.style.opacity) * 100 : 0;
   this.si = setInterval(function(){fadeEffect.tween()}, 20);
  },
  tween:function(){
   if(this.alpha == this.target){
    clearInterval(this.si);
   }else{
    var value = Math.round(this.alpha + ((this.target - this.alpha) * .05)) + (1 * this.flag);
    this.elem.style.opacity = value / 100;
    this.elem.style.filter = 'alpha(opacity=' + value + ')';
    this.alpha = value
   }
  }
 }
}();
</script>
</head>
<body>
<div id="wrapper">
<div id="fade">JavaScript淡入淡出渐变例子</div>
<div id="buttons">
 <div class="button" onclick="fadeEffect.init('fade', 1)">Fade In</div>
 <div class="button floatright" onclick="fadeEffect.init('fade', 0)">Fade Out</div>
</div>
<p>For more information visit 样式版权所有.<br />
</p>
</div>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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