JS 对象声明方式

2017-08-13 11:07:25 Albin Wong 489

前两种方法只能声明一个对象,第三种可以声明多个第二种方法常用

1. new Object  
```
var meinv = new Object();
//添加成员属性
meinv.name = '赵旭'; // .[] 元素操作符
meinv.age = 26;
meinv.heigh = '159cm';
// 动态特性
meinv['weight'] = '50kg';
var str = 'sanwei';
meinv[str] = '80 50 85';
// 删除
delete meinv.weight;
delete meinv['name'];
// 获取
alert(meinv.name);
alert(meinv[str]);
console.log(meinv);
// 成员方法
meinv.cook = function(){
    alert('我可以做饭');
}
meinv.date = function(someone){
    alert('我可以跟'+someone+'约会');
}
meinv['clear'] = function(){
    alert('我可以打扫卫生');
}
var str = 'chufa';
meinv[str] = function(){
    alert('我可以开罚单');
}
meinv.cook();
meinv.date('小明');
meinv[str]();
```
2. {}元素之间以,分隔
```
var computer = {
    //成员属性
    brand : 'acer',
    color : '黑色',
    size : '13.3inch',
    //成员方法
    code : function() {
        alert('我可以编程哦!!!');
    }, //这里的逗号不能省略
    movie : function() {
        alert('我可以播放电影....');
    },
    game: function(some) {
        alert('我可以跟'+some+'一起玩游戏');
    },
    info: function() {
        alert('品牌是'+this.brand+', 尺码是'+this.size+',颜色是'+this.color);
    }
};

//操作
alert(computer.brand);
alert(computer['color']);
var str = 'size';
alert(computer[str]);

//调用成员方法 
computer.code();
computer['movie']();
var func = 'game';
computer[func]('国外的玩家');
computer.info();
```
3. 构造函数
```
function Person(name, age, height) {
    //初始化成员属性
    this.name = name;
    this.age = age;
    this.height = height;
    
    //创建成员方法
    this.xiezuoye = function() {
        alert('我可以代写作业...');
    };
    
    this.zhengqian = function() {
        alert('我可以挣钱....');
    };
}

//创建对象
var qiangge = new Person('李强','29','180cm');
var hongkai = new Person('宏凯','31','170cm');

console.log(qiangge);
console.log(hongkai);

alert(qiangge.age);
alert(hongkai['height']);
var str = 'name';
alert(hongkai[str]);

qiangge.xiezuoye();
qiangge['zhengqian']();

//对象遍历
for(var i in qiangge) {
    document.write(i + ' -----> '+qiangge[i]+'<hr>');
}
/**
* name -----> 李强
* age -----> 29
* height -----> 180cm
* xiezuoye -----> function() { alert('我可以代写作业...'); }
* zhengqian -----> function() { alert('我可以挣钱....'); }
*/
```

### with简便操作
```
var beizi = {
    //成员属性
    color: 'white',
    height: '12cm',
    chandi: '日本',
    
    //成员方法
    zhuangshui: function() {
        alert('我可以装水...');
    },
    zhuang: function() {
        alert('我可以装一下....');
    }

}

alert(beizi.color);
with(beizi) {
    var height = 100;
    alert(height);
    zhuangshui();
}
```

(3) Comments

John Doe- Reply

February 26, 2013 at 1:18 pm
- saqib sarwar- Reply
  
  February 26, 2013 at 1:20 pm
  
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John Doe- Reply

February 26, 2013 at 1:27 pm

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JS 对象声明方式

(3) Comments

John Doe- Reply

saqib sarwar- Reply

John Doe- Reply

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