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css3由父元素找子元素
<body>
<div id=”one“>
<div></div>
<div></div>
<div></div>
</div>
</body>
<style>
#one div:nth-child(1)
</style>
css3由父元素找子元素
<body>
<div id=”one“>
<div></div>
<div></div>
<div></div>
</div>
</body>
<style>
#one div:nth-child(1)
</style>