JS uses a small example of the labth attribute to be empty and the short group of groups

1. Use length to clear the array:

Copy code code as follows:

<script>

var arr1 = ['aaa', 'bbbb', '// www.vevb.com'];

alert (ARR1);

arr1.Length = 0;

alert (ARR1); // The array is empty

</script>

2. Use length short group:

Copy code code as follows:

<script>

var arr1 = ['aaa', 'bbbb', 'c', 'd', 'e'];

arr1.Length = 3;

alert (ARR1); // Trimch the array AAA, BBBB, C

</script>