多个异步执行完之后做操作

async demo(){
let params = {
a:1,
};
const res = await getWxCode(params);
const p1 = new Promise(resolve=>{
resolve(res)
})
const p2 = new Promise(resolve=>{
resolve(res)
})
Promise.all([p1,p2]).then((res)=>{
console.log(res)
})
}