//Loading the variable
var mystr = '0000000020C90037:TEMP:data';

//Splitting it with : as the separator
var myarr = mystr.split(":");

//Resulting array structure
myarr = ['0000000020C90037', 'TEMP', 'data'];

//split into array of strings.
var str = "Well, how, are , we , doing, today";
var res = str.split(",");

var myString = 'no,u';
var MyArray = myString.split(',');//splits the text up in chunks

str.split(';');