那这个呢：
// 1. reset the array while keeping its referencearr1.length = 0;// 2. fill the first array with items from the second[].push.apply(arr1, arr2);
那这个呢：
// 1. reset the array while keeping its referencearr1.length = 0;// 2. fill the first array with items from the second[].push.apply(arr1, arr2);
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