1.使用length清空數(shù)組：

復(fù)制代碼 代碼如下:

<script>
    var arr1 = ['aaa','bbbb','http://www.survivalescaperooms.com'];
    alert(arr1);
    arr1.length = 0;
    alert(arr1); //數(shù)組為空
</script>

2.使用length截短數(shù)組：

復(fù)制代碼 代碼如下:

<script>
    var arr1 = ['aaa','bbbb','c','d','e'];
    arr1.length = 3;
    alert(arr1); //截斷數(shù)組aaa,bbbb,c
</script>