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>Fade In</div> <div>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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