js获取简单表单对象(1)

<form id="form">
    <input type="text" name="username" value="admin" />
</form>

<script>
    function formser(form) {
        var form = document.getElementById(form);
        var arr = {};
        for (var i = 0; i < form.elements.length; i++) {
            var feled = form.elements[i];
            switch (feled.type) {
                case undefined:
                case 'button':
                case 'file':
                case 'reset':
                case 'submit':
                    break;
                case 'checkbox':
                case 'radio':
                    if (!feled.checked) {
                        break;
                    }
                default:
                    if (arr[feled.name]) {
                        arr[feled.name] = arr[feled.name] + ',' + feled.value;
                    } else {
                        arr[feled.name] = feled.value;

                    }
            }
        }
        return arr
    }
    var myForm = new formser("form");
    console.log(typeof myForm.username);
   //结果：admin
</script>