JavaScript级联函数实现原理与链式调用示例

function Person() {
 this.name = '';
 this.age = 0;
 this.weight = 10;
}
Person.prototype = {
 setName:function(name){
  this.name = name;
  return this;
 },
 setAge:function(age){
  this.age = age;
  return this;
 },
 setWeight:function(weight) {
  this.weight = weight;
  return this;
 }
}
var p = new Person();
p.setName('Joh').setAge(26).setWeight(80);
console.log(p); // {name: "Joh", age: 26, weight: 80}