<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title> <style type="text/css">body,div,span{ margin: 0; padding: 0;} #div1{ width: 200px; height: 200px; background: red; position: relative; left: -200px; top: 0; } #div1 span { width: 20px; height: 50px; background: blue; position: absolute; left: 200px; top: 75px; }</style><script>var timer=null;function smove(taget){ clearInterval(timer); var ddd=document.getElementById('div1'); timer=setInterval(function(){ if(ddd.offsetLeft>taget) var speed=-10; else var speed=10; if(ddd.offsetLeft==taget) clearInterval(timer) else{ddd.style.left=ddd.offsetLeft+speed+'px'}},30) } </script> </head><body><div id='div1'> <span>分享</span> <!-- 点分享时div1有效，事件冒泡 --></div></body><script>window.onload=function(){ var ddd=document.getElementById('div1'); ddd.onmouseover=function(){ smove(0); } ddd.onmouseout=function(){ smove(-200); }}</script></html>
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