JS uses the array length property to empty and truncate an array of small examples

This article mainly introduces JS using the array length property to empty and truncated arrays of small examples, the need for friends can refer to

1. Use length to empty the array: The code is as follows: <script> var arr1 = [' aaa ', ' bbbb ', ' http://www.jb51.net '];     alert (ARR1);     arr1.length = 0; alert (ARR1);     Array is null </script> 2. Use the length truncated array: The code is as follows: <script> var arr1 = [' aaa ', ' bbbb ', ' C ', ' d ', ' e '];     Arr1.length = 3; alert (ARR1); Truncated array aaa,bbbb,c </script>