replce spaces with underscores javascript code example

Example 1: js replace space with underscore

var string = "my name";
string = string.replace(/ /g,"_"); //returns my_name

Example 2: js replace all spaces

var replaced = str.replace(/ /g, '_');

Example 3: javascript replace all spaces

var str = 'a b c';
var replaced = str.split(' ').join('_');