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feat: add 'readonly' modifier and fix write error #88

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Merged
merged 1 commit into from
Sep 16, 2019
Merged

feat: add 'readonly' modifier and fix write error #88

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32 changes: 31 additions & 1 deletion advanced/class.md
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Original file line number Diff line number Diff line change
Expand Up @@ -265,7 +265,7 @@ let a = new Animal('Jack');
```ts
class Animal {
public name;
private constructor (name) {
protected constructor (name) {
this.name = name;
}
}
Expand All @@ -291,6 +291,36 @@ class Animal {
}
```

### readonly

只读属性关键字，只允许出现在属性声明或索引签名中。

```ts
class Animal {
readonly name;
public constructor(name) {
this.name = name;
}
}

let a = new Animal('Jack');
console.log(a.name); // Jack
a.name = 'Tom';

// index.ts(10,3): TS2540: Cannot assign to 'name' because it is a read-only property.
```

注意如果 `readonly` 和其他访问修饰符同时存在的话，需要写在其后面。

```ts
class Animal {
// public readonly name;
public constructor(public readonly name) {
this.name = name;
}
}
```

### 抽象类

`abstract` 用于定义抽象类和其中的抽象方法。
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