how to use replaceall js code example

Example 1: how to replace all the string in javascript when the string is javascript variable

function name(str,replaceWhat,replaceTo){
    replaceWhat = replaceWhat.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
    var re = new RegExp(replaceWhat, 'g');
    return str.replace(re,replaceTo);
}

Example 2: javascript replaceall

//as of August 2020, not supported on older browsers
str.replaceAll("abc","def")