var Str = "Hello There!"

var SplitOn = " "

var Results = Str.split(SplitOn);

//Results[0] will be 'Hello' and Results[1] will be 'There!'

yourStr.split('') //by each char, you get an array of N elements, where N is the length of the string

yourStr.split(' ') //by space

yourStr.split(',') //by ,

var myString = "split string to char";

var myArray = [...myString];

/* 

*

*  myArray :

*  ["s", "p", "l", "i", "t", " ", "s", "t", "r", "i", "n", "g", " ", "t", "o", " ", "c", "h", "a", "r"]

*

*/