標籤：
1.img 圖片內容在不同解析度下置中顯示（如果隱藏多餘，在img外面套一個div 設定overflow： hidden。div的大小就是img顯示地區的大小）
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>無標題文檔</title><style type="text/css">body,div,p,a,img,ul,ol,li{ margin: 0; padding: 0;}#tab { overflow:hidden;
width:100%;要顯示的寬度 }#tab img{ overflow:hidden; width:1920px; height:447px; position: relative;
left:50%; 剛好在中間
margin-left:-960px;圖片寬度一半 }#tab>img:not(:first-child){ display:none; } </style><script> //js投影片 window.onload = function(){ var images = document.getElementsByTagName(‘img‘); var pos = 0; var len = images.length; setInterval(function(){ images[pos].style.display = ‘none‘; pos = ++pos == len ? 0 : pos; images[pos].style.display = ‘inline‘; },3000); };</script> </head> <body><div id="tab"> <img src="images/20160907_100403_003.jpg" width="1920px" height="447"/> <img src="images/20160907_100403_004.jpg" width="1920px" height="447"/> </div></body></html>
2.背景 圖片內容在不同解析度下置中顯示(示範的圖片寬度是1920px，當圖片寬度大於顯示屏的寬度時)
<div class="index-panel-pic1"></div>
.index-panel-pic1{ background: url(../images/20160907_100403_000.gif) no-repeat center center; width:100%; height:650px; background-size: cover;}
css 圖片內容在不同解析度下置中顯示(示範的圖片寬度是1920px，當圖片寬度大於顯示屏的寬度時)
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