我把 返回顶部 四个字换成了 图片 就不可以了。请问为什么。
- JScript code
<script>lastScrollY=0;function heartBeat(){var diffY;if (document.documentElement && document.documentElement.scrollTop) diffY = document.documentElement.scrollTop;else if (document.body) diffY = document.body.scrollTopelse {/*Netscape stuff*/}percent=.1*(diffY-lastScrollY);if(percent>0)percent=Math.ceil(percent);else percent=Math.floor(percent);document.getElementById("full").style.top=parseInt(document.getElementById("full").style.top)+percent+"px";lastScrollY=lastScrollY+percent;}suspendcode="<div id=\"full\" style='right:1px;POSITION:absolute;TOP:600px;z-index:100'><a onclick='window.scrollTo(0,0);'>返回顶部</a><br></div>"document.write(suspendcode);window.setInterval("heartBeat()",1);</script>
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啊偶
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reference:
http://www.cnblogs.com/insus/articles/1406122