标签：简单的 document style back fadeout func on() targe onclick
jq对渐入渐出进行封装，简单的使用连个方法就可以实现。fadeIn(),fadeOut();如果我们界面没有使用jq那么原生怎么实现呢？
我们讲解一下，这个原理。当我们要实现渐入的时候，首先是让隐藏的div慢慢的显示，通过让opacity慢慢从 0.0 （完全透明）到 1.0（完全不透明）。渐出就是逻辑反过来的。
下面我们直接贴代码：
css:
* {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}
html:
<div id="wrapper"> <div id="fade">JavaScript</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> </div>
js:
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 } } } }();
标签：简单的 document style back fadeout func on() targe onclick
原文地址：http://www.cnblogs.com/cczlovexw/p/7356456.html
