String.prototype.format

String.prototype.format.js

if(!String.prototype.format) {
  String.prototype.format = function() {
    var cnt = 0;
    var args = arguments;
    return this.replace(/(\%s)/g, function(match) {
      var term = typeof args[cnt] !== 'undefined' ? args[cnt] : match;
      cnt++;
      return term;
    });
  };
}