<!doctype HTML><html><head><meta charset="utf-8" /><title>TEST</title><link href="01.css" rel="stylesheet" type="text/css"/><script src='01.js'></script></head><body id='main'><div id=dlk><p id=dlk_ti>登录</p><input type='button' value='x' id='cancel'><div id=inset>账号<input type="text"/><br />密码<input type="text"/></div><input type="button" value="登录" id='dlk_btn' ><ul id="dlk_submenue"><div id='dlk_now_submenue' class='o1'>我在线上</div><li class="dlk_submenue_child o1" id='o1'>我在线上</li><li class="dlk_submenue_child o2" id='o2'>Q我吧</li><li class="dlk_submenue_child o3" id='o3'>离开</li><li class="dlk_submenue_child o4" id='o4'>忙碌</li><li class="dlk_submenue_child o5" id='o5'>请勿打扰</li><li class="dlk_submenue_child o6" id='o6'>隐身</li></ul></div></body></html>-----------------------------------------------------------------------------window.onload=dlk_move;function dlk_move(){ var mtitle=document.getElementById('dlk_ti'); mtitle.onmousedown=dlk_mdown;}function dlk_mdown(e){ event=e||window.event dlk=document.getElementById('dlk');dlk_x=dlk.offsetLeftdlk_y=dlk.offsetTopdlk_cx=event.clientX-dlk_xdlk_cy=event.clientY-dlk_ywin_w=document.documentElement.clientWidth-dlk.offsetWidth||document.body.clientWidth-dlk.offsetWidthwin_h=document.documentElement.clientHeight-dlk.offsetHeight||document.body.clientHeight-dlk.offsetHeight document.onmousemove=function(event){event=event||window.eventdlk.style.left=event.clientX-dlk_cx+"px";dlk.style.top=event.clientY-dlk_cy+"px";if(dlk.offsetLeft>win_w){ dlk.style.left=win_w-10+"px"}else if(dlk.offsetLeft<0){ dlk.style.left='10px';} if(dlk.offsetTop>win_h){ dlk.style.top=win_h-10+"px"}else if(dlk.offsetTop<0){ dlk.style.top='10px';} } document.onmouseup=function(){ document.onmousemove=null; document.onmouseup=null;}}为什么换一下位置if的限制作用就没了。。。。。。。。。？为啥
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