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类似于与jquery 的closest 相反的方法。
获取第一个后代,该后代含有某class。

div =>{
   return  fisrtCh = ????
}

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   document.querySelector('.a').firstElementChild

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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