<script >

        //定义一个返回Promise对象方法

     const getlist=((type)=>{

        

        //resolve表示完成操作

        //reject异常操作

        return  new Promise((resolve,reject)=>{

            // throw{

            //             name:‘typeErr‘,

            //             message:‘you should enter a number‘

            //         }

          if(type==1){

          resolve(‘错误啦。。。‘)}

          else{

          reject(‘对啦。。。‘)

        }

})

     })

        window.onload=( ()=>{

            

            //noawait();

             yawait();

        })

        

        //不用await

        const noawait=(()=>{

           getlist(2).then((result)=>{

            console.log(‘result‘);

            console.log(result);

           }).catch((err)=>{

            console.log(‘err me‘);

             console.log(err);

           })

        })

      //使用await方式接收

        const yawait=(async ()=>{

          try {

          await只接受resolve返回的内容

            let data =await getlist(1);

           console.log(data);

          } catch (error) {

           reject返回的需要在catch里进行捕捉

              console.log(error);

          }

           

        })

    </script>