js 隐藏层随鼠标移动 解决方法！
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><script type="text/javascript" language="javascript"><!--当文本框的内容为空时，显示鼠标跟随效果-->function showlianxi(status,ev){ var e= ev||window.event; var show = document.getElementById('showlianxi'); var obj=e.target||e.srcElement; if(fun()){switch(status){ case 'over': show.style.position='absolute'; if(e.pageX){ show.style.left=e.pageX+20+'px'; show.style.top=e.pageY+'px'; } else{ show.style.left=e.clientX + document.body.scrollLeft+ document.documentElement.scrollLeft+5; show.style.top=e.clientY + document.body.scrollTop+ document.documentElement.scrollTop+5; } show.style.display='block'; break; case 'out': show.style.display='none'; break; }} else{show.style.display='none'; }} <!--判断文本框的内容是否为空-->function fun(){ var temp=document.getElementById("username").value; if(temp==null||temp==''){ return true; }else{ return false; }}</script></head><body> <input type="text" id="username" onmouseout="showlianxi('out',event)" onmousemove="showlianxi('over',event)" /> <div id="showlianxi" style="display:none"> <a>请填写值</a> </div></body></html>?