jQuery Validate验证框架详解(推荐)

<select id="fruit" name="fruit" title="Please select at least two fruits" class="{required:true, minlength:2}" multiple="multiple">
  <option value="b">Banana</option>
  <option value="a">Apple</option>
  <option value="p">Peach</option>
  <option value="t">Turtle</option>
</select>