bind to change the function scope

bind.js

// bind to change the function scope and send arguments for the functions
Function.prototype.bind = function(context) {
    var __method = this,
    args = Array.prototype.slice.call(arguments, 1);
    return function() {
      var a = Array.prototype.concat(Array.prototype.slice.call(arguments), args);
      return __method.apply(context, Array.prototype.slice.call(a));
    }
};