1+ /**
2+ * public / private / protected
3+ * getter / setter
4+ */
5+ 6+ ( function ( ) {
7+ 8+ class A {
9+ protected num : number ;
10+ // 语法糖,在构造函数中定义属性,public age: number
11+ constructor ( num : number , public age : number ) {
12+ this . num = num ;
13+ this . age = age ;
14+ }
15+ }
16+ class B extends A {
17+ test ( ) {
18+ console . log ( this . num ) ;
19+ }
20+ }
21+ const b = new B ( 777 , 18 ) ;
22+ // b.num = 1;
23+ 24+ 25+ class Person {
26+ // 默认 public
27+ public age : number = 30 ;
28+ public readonly name : string = 'csxiaoyao' ;
29+ private _hobby : Array < string > ;
30+ 31+ constructor ( age : number ) {
32+ this . age = age ;
33+ this . _hobby = [ ] ;
34+ }
35+ 36+ // getter / setter
37+ /*
38+ getHobby() {
39+ return this._hobby;
40+ }
41+ setHobby(hobby: Array<string>) {
42+ this._hobby = hobby;
43+ }
44+ */
45+ get hobby ( ) {
46+ return this . _hobby ;
47+ }
48+ set hobby ( hobby : Array < string > ) {
49+ this . _hobby = hobby ;
50+ }
51+ }
52+ 53+ const per = new Person ( 18 ) ;
54+ // getter
55+ console . log ( per . hobby ) ;
56+ 57+ 58+ } ) ( ) ;
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