How to use Split in Javascript _ basic knowledge

In Javascript, the Split method is rarely used in the past. I have found some materials today.
Usage: myArray = string. split ("| ")
Note: "|" indicates the feature character to be cut, string indicates the string to be cut, and myArray indicates the cut result (stored in an array). Use myArray [n] and n = myArray. length.
At first, I used the thinking in asp to think about how to get the maximum subscript of myArray. It must not be Ubound (myArray). I did not find it for a long time, and finally I got it, in fact, arrays in Javascript have a length attribute, myArray. length-1 is the maximum subscript of the myArray array. It's easy to think about it.
Let's look at an example using split: use javascript to get the address bar parameters.

The Code is as follows: