// async基礎(chǔ)語法
async function fun0(){
    console.log(1);
    return 1;
}
fun0().then(val=>{
    console.log(val) // 1,1
})

async function fun1(){
    console.log('Promise');
    return new Promise(function(resolve,reject){
        resolve('Promise')
    })
}
fun1().then(val => {
    console.log(val); // Promise Promise
})

async function fun(){
    let a = await 1;
    let b = await new Promise((resolve,reject)=>{
        setTimeout(function(){
            resolve('setTimeout')
        },3000)
    })
    let c = await function(){
        return 'function'
    }()
    console.log(a,b,c)
}
fun(); // 3秒后輸出： 1 "setTimeout" "function"

function log(time){
    setTimeout(function(){
        console.log(time);
        return 1;
    },time)
}
async function fun(){
    let a = await log(1000);
    let b = await log(3000);
    let c = log(2000);
    console.log(a);
    console.log(1)
}
fun(); 
// 立即輸出 undefined 1
// 1秒后輸出 1000
// 2秒后輸出 2000
// 3秒后輸出 3000

// 使用async/await獲取成功的結(jié)果

// 定義一個異步函數(shù)，3秒后才能獲取到值(類似操作數(shù)據(jù)庫)
function getSomeThing(){
    return new Promise((resolve,reject)=>{
        setTimeout(()=>{
            resolve('獲取成功')
        },3000)
    })
}

async function test(){
    let a = await getSomeThing();
    console.log(a)
}
test(); // 3秒后輸出：獲取成功

function getData()
{
let value=await get();
value++;
await set();//set完成后返回?cái)?shù)據(jù)
return value;
}

var value=getData();

async function xxxx(){
var value=await getData();
return value;
}