Javascript中的方法链（Method Chaining）介绍

Method chaining, also known as named parameter idiom, is a mon syntax for invoking multiple method calls in object-oriented programming languages. Each method returns an object, allowing the calls to be chained together in a single statement.Chaining is syntactic sugar which eliminates the need for intermediate variables. A method chain is also known as a train wreck due to the increase in the number of methods that e one after another in the same line that ours as more methods are chained togethe even though line breaks are often added between methods.

方法链，也被称为命名参数法，是在面向对象的编程语言调用的调用多个方法的通用语法。每一个方法返回一个对象，允许电话连接到一起，在一个单一的声明。链接是语法糖，省去了中间变量的需要。方法链也被称为火车残骸中由于方法来相继发生的同一行以上的方法都锁在即使换行通常添加方法间的数量增加。

// chaining
$("#person").slideDown('slow')
   .addClass('grouped')
   .css('margin-left', '11px');

var p = $('#person');
p.slideDown('slow');
p.addClass('grouped');
p.css('margin-left', '11px');

function f(i){
  return function(e){
    i+=e;
    return function(e){
      i+=e;
      return function(e){
        alert(i+e);
      };
    };
  };
};
f(1)(2)(3)(4); //10

var func = (function() {
    return{
        add: function () {
            console.log('1');
            return{
                result: function () {
                    console.log('2');
                }
            }
        }
    }
})();

func.add().result();

Func = (function() {
    this.add = function(){
        console.log('1');
        return this;
    };
    this.result = function(){
        console.log('2');
        return this;
    };
    return this;
});

var func = new Func();
func.add().result();

var func = new Func();
func.add().result();

new Func().add().result();