Function bind

06.Router/basic/js/vue.js:217–222

* Simple bind, faster than native * * @param {Function} fn * @param {Object} ctx * @return {Function}

(fn, ctx)

   */

  function bind(fn, ctx) {
    return function (a) {
      var l = arguments.length;
      return l ? l > 1 ? fn.apply(ctx, arguments) : fn.call(ctx, a) : fn.call(ctx);
    };
  }

  /**
   * Convert an Array-like object to a real Array.