node38-await关键字

async function p1() {
    return 'p1';
}
async function p2() {
    return 'p2';
}
async function p3() {
    return 'p3';
}
async function run() {
    let r1 = await p1();
    let r2 = await p2();
    let r3 = await p3();
    console.log(r1);
    console.log(r2);
    console.log(r3);
 
}
run();