类型断言

[xiaoqufengdi]

大神，类型断言那一章，联合类型断言
const s1:number|string = 'hello'; const s2:number = s1 as number; // 报错

值实际是字符串断言成number会报错， 应该断言成字符串,或者用unkonwn中转一下断言成number
const s2:string= s1 as string; const s22: number = s1 as unknown as number

[ruanyf]

谢谢指出，已经改正