<!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>無標(biāo)題文檔</title><style>*{margin:0;padding:0;}body{width:1000px;height:100px;background:#F00}.main{height:50px;background:#999}.look{background:#009;width:800px;height:800px;margin:0 auto;}.book{background:#FF0;height:150px;}.look_top{background:#0F0;height;50px;width:70px;margin:0 auto;}.look_left{background:#990;height:200px;width:200px;float:left;}.look_right{background:#0FF;height:300px;width:300px;float:right;}</style></head><body><div class="main"></div><div class="look"> <div class="look_left"></div>? ? <div class="look_right"></div>? ? <div class="look_top"></div></div><div class="book"></div></body></html>look_top為啥不顯示 ? ?在div里打字后才顯示
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