JS String Replace All

Js:

String.prototype.replaceall=function (Reallydo, replacewith) {
Return This.replace (New RegExp (Reallydo, "G"), replacewith);
}

How to use:

var str= "Addfgfdgfdgfdbvcmbadd, VM";

Alert (Str.replaceall ("Add", "app"));

Popup Result: AppFGFDGFDGFDBVCMBAPP,VM

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There are direct replacement methods on the Internet:

var str= ' Everyone is a man, isn't it? ';
str = str.replace (//g, ' well ');
alert (str);

Expression//g here G, this g represents the global, do not give this configuration item is not all replaced.

Just this "?" cannot be replaced with a variable, so it is returned with a regular parameter.