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HTML for 属性


定义和用法

当与 <label> 元素一起使用时, for 属性指定标签绑定到的哪个表单元素。

当与 <output> 元素一起使用时, for 属性指定计算结果与用于计算的元素之间的关系。


适用于

for 属性可以在以下元素上使用

元素 属性
<label> for
<output> for

示例

例如

三个带标签的单选按钮

<form action="/action_page.php">
  <input type="radio" id="html" name="fav_language" value="HTML">
  <label for="html">HTML</label><br>
  <input type="radio" id="css" name="fav_language" value="CSS">
  <label for="css">CSS</label><br>
  <input type="radio" id="javascript" name="fav_language" value="JavaScript">
  <label for="javascript">JavaScript</label><br><br>
  <input type="submit" value="Submit">
</form>
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输出示例

执行计算并在 <output> 元素中显示结果

<form oninput="x.value=parseInt(a.value)+parseInt(b.value)">0
  <input type="range" id="a" value="50">100
  +<input type="number" id="b" value="50">
  =<output name="x" for="a b"></output>
</form>
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浏览器支持

for 属性对每个元素具有以下浏览器支持

元素
label
output 10.0 不支持 4.0 5.1  11.0

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