App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<picture>
    <source srcset="/statics/images/course/img_smallflower.jpg" media="(max-width: 400px)">
    <source srcset="/statics/images/course/img_flowers.jpg">
    <img src="/statics/images/course/img_flowers.jpg" alt="Flowers" style="width:auto;">
</picture>
<p>调整浏览器宽度和高度，背景在宽度小于 400px 时将改变。 </p>
</body>
</html>
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運(yùn)行結(jié)果