# :checked Selector

所属分类：选择器 > 表单 英文文档：:checked Selector

## checked selector

描述: 匹配所有勾选的元素。

- #### 添加的版本: 1.0jQuery( ":checked" )

这个 `:checked` 选择器适用于复选框和单选框。对于下拉框元素, 使用 `:selected` 选择器。

## 例子:

#### Example: 确定有多少input元素是选中的.

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    <!DOCTYPE html><html><head>  <style>  div { color:red; }  </style>  <script src="https://code.jquery.com/jquery-latest.js"></script></head><body> <form>  <p>    <input type="checkbox" name="newsletter" value="Hourly" checked="checked">     <input type="checkbox" name="newsletter" value="Daily">    <input type="checkbox" name="newsletter" value="Weekly">     <input type="checkbox" name="newsletter" value="Monthly" checked>    <input type="checkbox" name="newsletter" value="Yearly">  </p></form><div></div> <script>var countChecked = function() {  var n = $( "input:checked" ).length;  $( "div" ).text( n + (n === 1 ? " is" : " are") + " checked!" );};countChecked(); $( "input[type=checkbox]" ).on( "click", countChecked );</script> </body></html>

#### Demo:

#### Example: Identify the checked radio input.

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    <!DOCTYPE html><html><head>  <style>input, label { line-height: 1.5em; }</style>  <script src="https://code.jquery.com/jquery-latest.js"></script></head><body> <form>  <div>    <input type="radio" name="fruit" value="orange" id="orange">    <label for="orange">orange</label>  </div>  <div>    <input type="radio" name="fruit" value="apple" id="apple">    <label for="apple">apple</label>  </div>  <div>    <input type="radio" name="fruit" value="banana" id="banana">    <label for="banana">banana</label>  </div>  <div id="log"></div></form> <script>$( "input" ).on( "click", function() {  $( "#log" ).html( $("input:checked").val() + " is checked!" );});</script> </body></html>

#### Demo: