本文實例講述了JavaScript淡入淡出漸變的實現方法。分享給大家供大家參考。具體如下：
這里介紹JavaScript淡入淡出的文字漸變例子，用js來控制div標簽元素實現漸變顯示，漸變隱藏，只要在那個標簽里的內容，都可以淡入淡出，代碼簡單，便于修改完善，前端設計者必備的網頁特效。
運行效果如下圖所示：
具體代碼如下：
<!DOCTYPE html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>js代碼控制元素簡單的淡入淡出效果</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淡入淡出漸變例子</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 樣式版權所有.<br /></p></div></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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