很粗糙
var a = '1'
async function all(a) {
var res = await resolveAfter2Seconds(a);
console.log(res)
console.log('coll...');
}
all(a);
function resolveAfter2Seconds(a) {
return new Promise(resolve => {
resolve('resolve')
setTimeout(() => {
}, 2000)
})
}