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JavaScript淡入淡出渐变简单实例

2019-11-20 11:54:11
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本文实例讲述了JavaScript淡入淡出渐变的实现方法。分享给大家供大家参考。具体如下:

这里介绍JavaScript淡入淡出的文字渐变例子,用js来控制div标签元素实现渐变显示,渐变隐藏,只要在那个标签里的内容,都可以淡入淡出,代码简单,便于修改完善,前端设计者必备的网页特效。

运行效果如下图所示:

具体代码如下:

<!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 ? target : flag ? 100 : 0;   this.flag = flag || -1;   this.alpha = this.elem.style.opacity ? 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>

希望本文所述对大家的javascript程序设计有所帮助。

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