Underscore.JS wrap方法

_.wrap(function, wrapper)

var _ = require('underscore');

var greeting = function(name) { return "hello: " + name + "!"; };

greeting = _.wrap(greeting, function(func) {
  return "Welcome and, " + func("Sam") + ", Bye!";
});
console.log(greeting());

>node tester.js

Welcome and, hello: Sam!, Bye!