replace 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: javascript replace space by underscore

// replaces space with '_'
str = str.replace(/ /g, "_");
// or
str = str.split(' ').join('_');

Example 3: js replace all spaces

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