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一些建议 about typescript-tutorial HOT 3 OPEN

linjialiang avatar linjialiang commented on August 23, 2024
一些建议

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Comments (3)

linjialiang avatar linjialiang commented on August 23, 2024

箭头函数可选参数

const xjjInfo: (name: string, age?: number) => void = (
  name: string,
  age: number
) => {
  if (age) {
    console.log(`小姐姐姓名:${name}, 今年:${age}岁`);
  } else {
    console.log(`小姐姐姓名:${name}`);
  }
};

下面哪种写法更加合理

const xjjInfo: (name: string, age?: number) => void = (
  ...
- age: number
+ age?: number
) => {
  ...
};

from typescript-tutorial.

linjialiang avatar linjialiang commented on August 23, 2024

下面这句话是有问题的

- 需要注意的是,可选参数必须接在必需参数后面。换句话说,可选参数后面不允许再出现必需参数了
+ 需要注意的是,函数允许参数全部都是可选参数,可选参数后面不允许再出现必需参数

from typescript-tutorial.

linjialiang avatar linjialiang commented on August 23, 2024

下面这条断言语句会报错

(window as any).foo = 1;

from typescript-tutorial.

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