jquery 数组 json jquery数组赋值

<select id="single">
  <option>Single</option>
  <option>Single2</option>
</select>
<select id="multiple" multiple="multiple">
  <option selected="selected">Multiple</option>
  <option>Multiple2</option>
  <option selected="selected">Multiple3</option>
</select><br/>
<input type="checkbox" value="check1"/> check1
<input type="checkbox" value="check2"/> check2
<input type="radio" value="radio1"/> radio1
<input type="radio" value="radio2"/> radio2

$("#single").val("Single2");//设置id为single的value值
$("#multiple").val(["Multiple2", "Multiple3"]);//设置id是multiple的多个option的值，以数组的形式
$("input").val(["check2", "radio1"]);