- 是由键-值组成的无序集合
var xiaoming = {
name: '小明',
birth: 1990,
height: 1.70,
weight: 65,
score: null
'middle-school': 'No.1 Middle School'
};
- 访问元素
xiaoming.name; // '小明'
xiaoming['name']; // '小明'
xiaoming['middle-school']; // 'No.1 Middle School'
xiaoming.age; // undefined
- 添加或删除属性
xiaoming.age = 18; // 新增一个age属性
xiaoming.age; // 18
delete xiaoming.age; // 删除age属性
xiaoming.age; // undefined
delete xiaoming['name']; // 删除name属性
xiaoming.name; // undefined
delete xiaoming.school; // 删除一个不存在的school属性也不会报错
网友评论