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;
 });