js foreach遍历

JS中的forEach()方法是用来遍历数组的一种方式。它接受一个函数作为参数，这个函数会被应用到数组的每个元素上。\[1\]这个函数可以有三个参数，分别是当前元素的值、当前元素的索引和原数组。\[2\]forEach()方法没有返回值，它只是针对每个元素调用传入的函数。\[1\]需要注意的是，forEach()方法不能被打断，也没有返回值。\[3\]对于基本数据类型的数组，forEach()方法无法修改原数组的值，而对于引用类型的数组，可以通过forEach()方法修改原数组的值。
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