js foreach 遍历 集合

在JavaScript中，可以使用forEach()方法来对数组进行遍历。这个方法会对数组的每个元素依次执行传入的函数。forEach()方法的回调函数有三个参数，分别是当前元素的值，索引值和原数组。使用forEach()方法遍历数组时，不能使用break关键字来打断循环，而且forEach()方法没有返回值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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