class的constructor里面有await

Question

class A{
    constructor(){
        await this.sayHi();
    }
    async sayHi(){
        await ...
    }
}

constructor里有await，async写在哪里

Answer 1

this.sayHi().then()吧 构造函数async不返回promise了吗？

Answer 2

哈哈，你得换个思路才行

class AsyncConstructor {

constructor() {
    return (async () => {

        // All async code here
        this.value = await asyncFunction();

        return this; // when done
    })();
}

}
let instance = await new AsyncConstructor();

Answer 3

constructor 不允许定义为 async 函数。可以：

constructor() {
    this.init();
}

async init() {
    await this.sayHi();
}