對象主要具有：行為——方法，特征——屬性。 [TOC] # 1. 對象的創建 <mark>語法1：字面量語法</mark> ```js // 創建 var object = { name: 'zs', age: 18, sex: true, sayHi: function () { console.log(this.name); } }; // 調用 object.name; // 或object["name"] object.sayHi(); // 或object["sayHi"] ``` <mark>語法2：new Object()方式</mark> ```js // 創建 var person = new Object(); person.name = 'lisi'; person.age = 35; person.job = 'actor'; person.sayHi = function(){ console.log('Hello,everyBody'); } // 調用 person.name; // 或 person["name"] person.age; // 或 person["age"] person.sayName; // 或 person["sayName"] ``` <mark>語法3：工廠函數</mark> ```js function createPerson(name, age, job) { var person = new Object(); person.name = name; person.age = age; person.job = job; person.sayHi = function(){ console.log('Hello,everyBody'); } return person; } var p1 = createPerson('張三', 22, 'actor'); ``` 或者： ``` function createPerson (name, age) { return { name: name, age: age, sayName: function () { console.log(this.name) } } } ``` <mark>語法4：自定義構造函數</amrk> ```js function Person(name,age,job){ this.name = name; this.age = age; this.job = job; this.sayHi = function(){ console.log('Hello,everyBody'); } } var p1 = new Person('張三', 22, 'actor'); ``` 更好的對象創建方法見：12.4章。 # 2. 對象的遍歷與刪除 <mark>1. 使用for/in語句遍歷對象</mark> ```js var obj = {}; for (var i = 0; i < 10; i++) { obj[i] = i * 2; } for(var key in obj) { console.log(key + "==" + obj[key]); } ``` <mark>2. 刪除對象</mark> ```js function Fun() { this.name = 'mm'; } var obj = new Fun(); console.log(obj.name); // mm delete obj.name; console.log(obj.name); // undefined ```