情況一百侧、banner圖總長(zhǎng)度為1920px天揖、窗口縮小時(shí)撑柔，圖片居中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<html>
<head>
<title>Title</title>
<style>
* {
margin: 0;
padding: 0;
}
#bannerWrap {
width: 100%;
position: relative;
overflow: hidden;
height: 240px;
background-color: red;
}
#bannerWrap .banner {
width: 1920px;
position: absolute;
left: 50%;
margin-left: -960px;
}
#bannerWrap .banner img {
width: 100%;
}
</style>
</head>
<body>
<div id="bannerWrap">
<div class="banner">
<img src="download-7.jpg">
</div>
</div>
</body>
</html>
</body>
</html>
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