JavaScript programming solves the exam score statistics Problem

Project Practices:

There are a total of 25 questions for this exam, each of which is a two-choice and One-choice question with a total score of 100.

The javascript code is as follows:

1 /**//**
2 * @ author georgewing
3 */
4 function preparecheckbox (){
5 Document. getelementbyid ("Submit"). onclick = function (){
6 selectedcheckbox (4 );
7}
8}
9 function selectedcheckbox (x ){
10 var oinput = Document. getelementsbytagname ("input ");
11 var itotal = 0;
12 For (VAR I = 0; I <oinput. length; I ++ ){
13 if (oinput [I]. classname = "checkedradio "){
14 if (oinput [I]. Checked ){
15 // Add X point
16 itotal = itotal + X;
17}
18 else {
19 // Add 0 point
20 itotal = itotal + 0;
21}
22}
23
24}
25 document. getelementbyid ("Total"). setattribute ("value", itotal );
26 alert (itotal );
27}

The above Code has the problem of unnecessary DOM-2 programming model, the program is improved below:

var formElms = document.forms['form'].elements;var totalElm=formElms['Total'];var totalNum = 0;var selectedCheckBox = function(x){    for(var i=0;i< formElms.length;i++) {if(formElms[i].type=='radio') {            if(formElms[i].checked) {                //add x point                totalNum = totalNum + x;            }            else {                // add 0 point                totalNum = totalNum + 0;            }        }    }    //End for-Loop    totalElm.value = totalNum;    alert(totalElm.value);};document.forms['form'].onsubmit = function() {      selectedCheckBox(4);}