摘要：<div style="width:0;height:0;overflow: hidden;border-top:4px solid transparent;border-left:4px solid transparent;border-right:4px solid transparent;bo 阅读全文

摘要：//方法一#box{ width:120px; height:160px; border:1px solid red; position:absolute; top:50%; left:50%; margin-left:-60px; margin-top:-80px;}//方法二 #box{ wid 阅读全文