练习

1-

 <script>
        Promise.resolve(10).then(res=>{
            console.log(10);
        }).catch(()=>{
            console.log(20);
        }).then(()=>{
            console.log(30);
            throw "error"
        }).then(()=>{
            console.log(40);
        })
    </script>  //10 30

2-

<script>
        Promise.resolve().then(()=>{
            console.log(1);
            throw "error"
        }).catch(err=>{
            console.log(err);
        }).catch(()=>{{
            console.log(3);
        }}).then(()=>{
            console.log(4);
        })
    </script>  //1 error 4