async和await 优雅处理异步

function delay(word) {
    return new Promise((resolve, reject) => {
        setTimeout(()=>{
            resolve('hello ' + word)
        }, 2000)
    })
}
async function start(){
    const word1 = await delay('孙悟空')
    console.log(word1)
    const word2= await delay('猪八戒')
    console.log(word2)
    const word3 = await delay('沙悟净')
    console.log(word3)
}
start()