JS gets the last element of the array

(1) JS built-in pop method

The Pop () method deletes and returns the last element of the array, noting that it also deletes the last element of the original array while getting the last element of the array. If the array is already empty, the method does not change the array and returns the undefined value, such as:

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<script> var args=new Array ([' www '],[' jb51 '],[']); Alert (Args.pop ());//net </script>

(2) to be obtained according to the length method, for example:

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<script> var args=new Array ([' www '],[' jb51 '],[']); Alert (args[args.length-1]);//net </script>

These are