JavaScript复选框问题

Question

the following code just says unexpected identifier;

var icheckBoxes = $('input[type="checkbox"]');
            for(int i=0; i < icheckBoxes.length; i++) {
                if (!icheckBoxes[i].is(":checked")) { 
                    $('input[type="checkbox').addClass('has-error');    
                    AgreeIsActive = false;
                    $('#AgreementSubmit').prop('disabled', false);  
                   return;
                }
            }

Seems to be the int as the culprit but i tried it to change it to var but no success and got a different error:

Uncaught TypeError: icheckBoxes[i].is is not a function

Update#1

New Code added with the help

var icheckBoxes = $('input[type="checkbox"]');
            alert(icheckBoxes.length);
            for(var i=0; i < icheckBoxes.length; i++) {
                alert(i);
                //if (!icheckBoxes[i].is(":checked")) { 
                if(!icheckBoxes.eq(i).is(":checked")) { 
                    alert(i);
                    $('input[type="checkbox').addClass('has-error');    
                    AgreeIsActive = false;
                    $('#AgreementSubmit').prop('disabled', false);  
                   return;
                }
            }

it says the length is 4 and then it goes inside and it alerts 4 times 0 and the next alert which is inside the if condition, it just alerts it 1 time and that is also 0

Answer 1

icheckBoxes[i].is(":checked")

should be

icheckBoxes.eq(i).is(":checked")

[] breaks the element out of the jQuery object and is() is a jQuery method.

Also as a side note, $('input[type="checkbox') is missing the "] on the end of it to make it a valid selector.