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watak

返回值:String,Array

val([val|fn|arr])

概述

获得匹配元素的当前值。

在 jQuery 1.2 中,可以返回任意元素的值了。包括select。如果多选,将返回一个数组,其包含所选的值。

参数

valStringV1.0

要设置的值。

function(index, value)FunctionV1.4

此函数返回一个要设置的值。接受两个参数,index为元素在集合中的索引位置,text为原先的text值。

arrayArray<String>V1.0

用于 check/select 的值

示例

无参数 描述:

获取文本框中的值

jQuery 代码:
$("input").val();

参数val 描述:

设定文本框的值

jQuery 代码:
$("input").val("hello world!");

回调函数 描述:

设定文本框的值

jQuery 代码:
$('input:text.items').val(function() {
  return this.value + ' ' + this.className;
});

参数array 描述:

设定一个select和一个多选的select的值

HTML 代码:
<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
jQuery 代码:
$("#single").val("Single2");
$("#multiple").val(["Multiple2", "Multiple3"]);
$("input").val(["check2", "radio1"]);


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