JS數組移除元素的方法

1. 修改Arr的length let arr = [1,2,3,4,5,6,7,8,9]; arr.length = 3; console.log('length',arr.length); console.log('arr',arr); 2.delete (修改Arr的內容,但length不變) let arr = [1,2,3,4,5,6,7,8,9]; delete arr[2]; con

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