因需要定位某个HTML元素(例如:div)距离页顶的高度,想用offsetTop来取值,结果却发现CSS中如果使用了float:left;之类的写法后,竟然会导致取到的值不一样。 没有使用float:left;取的到值是正常值200; <!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> <title>Float对offsetTop的影响</title> <meta http-equiv="Content-Type" content="text/html;charset=gb2312" /> <meta name="Copyright" content="(c)" /> <meta name="Author" content="CNLei" /> <style type="text/css" media="all"> body {margin:0;padding:0;} #Top {height:100px;} #Main {padding:100px;} #IECN {width:200px;height:50px;background:#f00;color:#fff;} </style> <script type="text/javascript"> <!-- function ShowIt(o) { alert(o.offsetTop); } --> </script> </head> <body> <div id="Top">#Main {padding:100px;} 没有使用float属性,取到的offsetTop的值正常:200。</div> <div id="Main"> <div id="IECN" onclick="ShowIt(this);">点击此处试试</div> </div> </body> </html> 使用了float:left;后,取的值却变成了100,平白无故的少了100 <!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> <title>Float对offsetTop的影响</title> <meta http-equiv="Content-Type" content="text/html;charset=gb2312" /> <meta name="Copyright" content="(c)" /> <meta name="Author" content="CNLei" /> <style type="text/css" media="all"> body {margin:0;padding:0;} #Top {height:100px;} #Main {padding:100px;float:left} #IECN {width:200px;height:50px;background:#f00;color:#fff;} </style> <script type="text/javascript"> <!-- function ShowIt(o) { alert(o.offsetTop); } --> </script> </head> <body> <div id="Top">#Main {padding:100px;float:left;} 使用了float属性,取到的offsetTop的值只有100了,无故少了100。</div> <div id="Main"> <div id="IECN" onclick="ShowIt(this);">点击此处试试</div> </div> </body> </html>
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