- 取值
用object.prop方式取值
var company = {
name: 'google',
age: '28',
money: 'I do not known'
}
company.name //'google'
- 用object['propname']
当属性名不是一个有效的变量名时，只能使用这种方法获取
var company = {
name: 'google',
age: '28',
money: 'I do not known',
'my-job': 'coding'
}
company['my-job'] // 'coding'
注意：定义一个Object时，属性名尽量为有效的变量名，这样便于取值
- 可以自由的添加删除对象的属性
var jake = {
name: '小明'
};
jake.age; // undefined
jake.age = 18; // 新增一个age属性
jake.age; // 18
delete jake.age; // 删除age属性
jake.age; // undefined
delete jake['name']; // 删除name属性
jake.name; // undefined
delete jake.school; // 删除一个不存在的school属性也不会报错
判断Object的某个属性是否存在
- in
var company = {
name: 'google',
age: '28',
money: 'I do not known'
}
'name' in company // true
'age' in company // true
- hasOwnProperty
var company = {...}
'name' in company // true
'toString' in company // true
in虽然能判断属性是否存在，但是对象继承的属性也会参与判断，就导致上面这种情况，这时就需要使用hasOwnProperty
var company = {...}
company.hasOwnProperty('name') // true
company.hasOwnProperty('toString') // false
