SOURCE

function call(cb){
    console.log(Date.now())
    const res = {
        status:0
    }
    setTimeout(function(){
        cb(res);
    },1000);
}

function fun1(){
    return new Promise((resolve) =>{
        call((res) => {
            // if(res.status == '0'){
            //     console.log(3)
            //     resolve();
            // } else {
            //     call(res => {
            //         resolve();
            //     })
                
            // }
            console.log(2)
            resolve(3)
            console.log(Date.now())
        })
    })
}
function fun2(){
    console.log(4)
    setTimeout(function(){
        console.log(6)
    },0)
    return new Promise((resolve) =>{
        call(() => {
            console.log(5)
            resolve()
            console.log(Date.now())
        })
    })
}
// fun2();
async function fun3(){
    let a = await fun1();
    console.log(a);
    await fun2();
}
async function init(){
    console.log(1)
    await fun3()
    console.log(7)
}
init();