async 与 await

Posted 2022-01-21 Rand Tsui

const doSometing = t => 
    return new Promise(resolve => 
        setTimeout(() => 
            resolve(t);
        , t);
    );
;
const doSometing2 = t => 
    return t;
;

const fun = async () => 

    let d3 = await doSometing2(2500);
    console.log(d3); //不需要等待，直接输出2500

    let d2 = await doSometing(1500);   //阻塞1500毫秒后下面的代码才执行
    console.log(d2); //1500

    try
        let d1 = await doSometing(1000);   //阻塞1000毫秒后下面的代码才执行
        console.log(d1); //1000
    
    finally 
        console.log(123); //最后输出
    
;

fun();