base库插件---form

$().extend('serialize', function () {
    for (var i = 0; i < this.elements.length; i ++) {
        var form = this.elements[i];
        var parts = {};
        for (var i = 0; i < form.elements.length; i ++) {
            var filed = form.elements[i];
            switch (filed.type) {
                case undefined : 
                case 'submit' : 
                case 'reset' : 
                case 'file' : 
                case 'button' : 
                    break;
                case 'radio' : 
                case 'checkbox' : 
                    if (!filed.selected) break;
                case 'select-one' : 
                case 'select-multiple' :
                    for (var j = 0; j < filed.options.length; j ++) {
                        var option = filed.options[j];
                        if (option.selected) {
                            var optValue = '';
                            if (option.hasAttribute) {
                                optValue = (option.hasAttribute('value') ? option.value : option.text);
                            } else {
                                optValue = (option.attributes('value').specified ? option.value : option.text);
                            }
                            parts[filed.name] = optValue; 
                        }
                    }
                    break;
                default :
                    parts[filed.name] = filed.value;
            }
        }
        return parts;
    }
    return this;
});