Answers for "js replace all whitespace"

javascript replace all space

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

js replace all spaces

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

javascript replace all spaces

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

javascript replace all spaces

var string = "Javascript is fun";
var newString = string.replace(" ", "_");
console.log(newString); // Javascript_is_fun