How to replace all the blank spaces in Javascript

Hi experts,

I have a string in jabvascript . There is a requirement to replace all the blank spaces with a particular character . How can I do so ?

using replace  with regular expression you can do this.

var replaceText = "_";
var OutPut= " this is only for testing ";
OutPut= OutPut.replace(/\s+/g, replaceText);