js异步处理async/await

async fetch(){
  let res = await ajaxFn(data);
  if(res){
    //赋值,执行代码
  }    
}

fetch();

const testFn = async() => {
  ajaxFn(['param']).then((res) => {
    //代码
  });
}
testFn ();

const testFn = (param) => {
  ajaxFn(param).then((res) => {
    //代码
  });
}
testFn ();

const testFn = async() => {
    const result = await ajaxFn(param);
    console.log('result:', result)
    //代码
}
testFn ();