<!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>無標題文檔</title><style type="text/css">#apDiv1 { position: absolute; left: 80px; top: 136px; width: 956px; height: 313px; z-index: 1; background:red; opacity:0.5;}</style></head><body> <div id="apDiv1"> <div style="width:100px; height:100px; background-color:blue;position:absolute;"></div></div></body></html>我需要的是里面的div的背景圖可以不透明的展示出來，該怎么做，求大神啊
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