JavaScript——对象

 1 var 对象名={
 2       属性名：属性值,
 3       属性名：属性值,
 4       属性名：属性值
 5 }
 6 
 7 //定义了一个person对象，它有四个属性！
 8 var person={
 9       name:"cl",
10       age:19,
11       email:"123456789@qq.com",
12       score:0
13 }

1 person.name="cl"
2 "cl"
3 person.name
4 "cl"

1 delete  haha
2 underfined

1 delete person.name
2 true
3 person

1 person.haha="haha"
2 "haha"
3 person

1 ‘age‘ in person
2 true
3 //继承
4 ‘toString‘ in person
5 true

1 person.hasOwnProperty(‘toString‘)
2 false
3 person.hasOwnProperty(‘age‘)
4 true