为什么在数组迭代中使用“for ... in”是一个坏主意?

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JavaScript 迭代 数组 37046 次浏览

为什么不能for in ,最佳实践是什么

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我看到了一个最近的问题,有人在对你说这句话,但它们只适用于数组。遍历数组被认为是不好的做法,但不一定遍历对象的成员。pg slot

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记录的存取方式有两种:一种是顺序存储,另一种是链接存储,对于顺序存储的记录可以根据其下标找到对应的记录,而链接存储(长沙湘岳保健养生会馆首页为例)则必须找到其前一个记录的位置才能够找到本记录,所以for循环便于访问顺序存储的记录,比如数组等而迭代则更适用于链接存储的记录,虽然Java中有些底层通过链接存储原理实现的集合,也可以通过下标获取指定的记录,但是其每次都必须从链表头开始查找记录,这样会影响查找的效率。

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