bind.js

bind.js

if( !Function.prototype.bind ){
  Function.prototype.bind = function( obj ){
    var args =[], that = this;
    if( arguments.length > 1){
      args = [].slice.call(arguments , 2);
    }
    
    return  function (arg){
      return that.apply( obj , args.cancat([].slice.call.arg));
    }
  }
}