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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <style> div.container { width:30em; border:1em solid; } div.box { box-sizing:border-box; -moz-box-sizing:border-box; /* Firefox */ width:50%; border:1em solid red; float:left; } </style> </head> <body> <div class="container"> <div class="box">这个 div 占据了左边的一半。.</div> <div class="box">这个 div 占据了右边的一半。</div> </div> </body> </html>