验证是否更改了表格

public class Person {
  String first;
  String last;
  int prevHash;
  @Override
  public int hashCode() {
    // does not include the value of currHash
    String stringHash = String.format(\"%1$-29s%2$-29s\", first,last);
    return stringHash.hashCode();
  }
}

public class PersonValidator  implements Validator {
  public void validate(Object obj, Errors e) {
    Person p = (Person) obj;
    if (p.hashCode() == p.getPrevHash()) {
      e.reject(\"person\", \"unchanged\");
    } 
  }
  ...
}

   $(document).ready(function() {
        var isFormChanged = false;
        var isConfirmed = false;
        $(\"form :input\").change(function() {
            console.log($(this).attr(\'name\'));
            isFormChanged = true;
        });

        $(\"#storeForm\").submit(function(event) {
            if (!isConfirmed) {
                event.preventDefault();
            }
            if (isFormChanged) {
                console.log(\"Form has changed\");
                $(\":submit\").addClass(\"btn-danger\");
                $(\":submit\").text(\"Confirm\");
                isConfirmed = true;
            }
        });
    });