Use Error and try catch

<script>
    function p1() {
        return new Promise(function (resolve, reject) {
            Reject ( new new Error ( "Network Error" ))
        })
    }
    async function Getdata() {
        try {
            var t1 = await p1();
        }
        catch (e) {
            console.log(e);
        }
    }
    $(function () {
        Getdata();
    })
</script>