Unknown JSLint Errors

Question

I'm getting the following errors from JSLint, and I can't understand them:

-All questions have been answered-

Any help on any of these?

use /*jslint browser: true, devel: true */
function submit() {
    "use strict";
    document.forms.form.submit();
    var Mathematics = document.personal.Mathematics;
    var OMathematics = document.personal.OMathematics;
    var Sci = document.personal.Sci;
    var OSci = document.personal.OSci;
    var ELA = document.personal.ELA;
    var OELA = document.personal.OELA;
    var SS = document.personal.SS;
    var OSS = document.personal.OSS;
    var Elec1 = document.personal.Elec1;
    var OElec1 = document.personal.OElec1;
    var Elec2 = document.personal.Elec2;
    var OElec2 = document.personal.OElec2;
    var Elec3 = document.personal.Elec3;
    var OElec3 = document.personal.OElec3;
    var Owed = 0;
    function calc(n, o) {
        if (n >= 90) {
            Owed = Owed + 1;
            if (n >= 95) {
                Owed = Owed + 1;
            }
        }
        else if (o >= 80) {
            Owed = Owed + 0.5;
        }
        if (n > o) {
            Owed = Owed + 0.5;
        }
        if (n < o) {
            if (n > 95) {
                Owed = Owed - 0.25;
            }
        }
    }
    calc(Mathematics, OMathematics);
    calc(Sci, OSci);
    calc(ELA, OELA);
    calc(SS, OSS);
    calc(Elec1, Elec1);
    calc(Elec2, Elec2);
    calc(Elec3, Elec3);
    alert(Owed);
}​

Here is the code in context: http://jsfiddle.net/Aidoboy/AdzwC/

exceptions being used: "many var statements per function" and "messy white space"

Answer 1

'document' was used before it was defined

You get this because the document variable has not been declared. You can tell JSLint that it should assume the code will run in a browser and therefore assume that things like document and window are pre-defined. You can do so with a JSLint comment at the top of your file:

/*jslint browser: true */

---

['form'] is better written in dot notation

Since you know the name of the property, there is no need to use square bracket notation:

document.forms.form.submit();

---

'alert' was used before it was defined

You can use the devel option to prevent this error (you also use it to allow, for example, console.log calls):

/*jslint browser: true, devel: true */

---

Unexpected '​'

There is some invisible character after the closing brace. Just delete that character to remove this error.