Answers for "js replace all substrings in string"

javascript replace all string

// String.prototype.replaceAll(searchValue, replaceValue)

'x'.replace('', '_');
// → '_x'

'xxx'.replace(/(?:)/g, '_');
// → '_x_x_x_'

'xxx'.replaceAll('', '_');
// → '_x_x_x_'

how to replace all the string in javascript when the string is javascript variable

function name(str,replaceWhat,replaceTo){
    var re = new RegExp(replaceWhat, 'g');
    return str.replace(re,replaceTo);
}