当用户在提示框上按Escape键时，我需要显示错误，但是下面的代码似乎不起作用，任何答案？

Question

function(catchError) {
    try {

       var firstname = prompt("please enter your first name");

}

    catch (error) {

       alert(error.message);

}} 

1. how can I remove this problem

2 also make this work in google chrome

Answer 1

prompt will return null if cancel or the escape key is pressed. Just check for it:

var firstname = prompt("please enter your first name");
if(firstname !== null) {

} else {
    // ESC or cancel pressed
}