Javascript and jquery verify the single-dataset, check box, and drop-down box _ javascript tips-js tutorial

This article mainly introduces the specific code for verifying single-dataset, check box, and drop-down box by js and jquery respectively. For more information, see this article), multi-choice box (checkbox), drop-down box (select), share with you for your reference, the specific content is as follows
(1). First, single commit (radio ),Radio and checkbox have the same name value. Multiple of them cannot follow the common text box. value Method when obtaining the radio value, but determine which one is selected.

Js verification is to use getElementsByName () to get the Array
The js Code is as follows:

Script function test () {var sex = document. getElementsByName ("sex"); var flag = 0; for (var I = 0; I
 
  
Male
  Female
  
 

It's much easier to use jQuery for verification, so you can do less with writing and more: