javascript - 在对象中创建 transient JavaScript 变量

Question

function Player(name)
    {            
        this._name = name;                     
        this._id = "Player"+(Player_ID++);
    };

var newPlayer = new Player(newUnitName);
alert(JSON.stringify(newPlayer));

我想做的是停止显示 id 值。有没有办法让 id 变量变 transient 。请帮忙

Answer 1

每个对象都有一个方法 toJSON()，当对象应该使用 JSON.stringify() 序列化时调用该方法。

来自 MDN article在 JSON.stringify() 上:

If an object being stringified has a property named toJSON whose value is a function, then the toJSON() method customizes JSON stringification behavior: instead of the object being serialized, the value returned by the toJSON() method when called will be serialized

---

以下示例创建了一个不同的序列化函数，它将排除 _id:

var Player_ID = 0;
function Player(name) {            
 this._name = name;                     
 this._id = "Player"+(Player_ID++);
 this.toJSON = function() {
   return {
     _name: this._name
   };
 };
};

var newPlayer = new Player('Name 1');
console.log(JSON.stringify(newPlayer)); // prints {"_name": 'Name 1'}

检查工作demo .