javascript - How do i alert a users name when enterd into a prompt -

i want know how alert users name when answer in prompt box, have tried

    var check=propmt("enter name","name")     if (check==='') {     alert("welcome", + check)     } 

1. spell prompt correctly
2. don't put , before +
3. change test alert if user enters other empty string

such:

var check=prompt("enter name","name") if (check !== '') {     alert("welcome " + check); }