:submit

选择所有提交按钮，即 type 为 submit 的元素。

:submit 选择器主要用于 button 或者 input 元素。注意，某些浏览器默认把没有设置 type 的 <button> 元素看做 type="default" ，而其他浏览器(比如IE)则并非如此。

示例:

查找所有作为 td 元素后代的提交按钮。

<!DOCTYPE html>
<html>
<head>
<style>
  textarea { height:45px; }
  </style>
<script src="jquery.min.js"></script>
</head>
<body>


<table>
<form>
<table id="exampleTable" border="1" cellpadding="10" align="center">

    <tr>
        <th>
            Element Type
        </th>
        <th>
            Element
        </th>

    </tr
    <tr>
        <td>
            <input type="button" value="Input Button"/>
        </td>

    </tr>
    <tr>
        <td>
            <input type="checkbox" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="file" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="hidden" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="image" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="password" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="radio" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="reset" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="submit" />
        </td>

    </tr>
    <tr>
        <td>
            <input type="text" />
        </td>

    </tr>
    <tr>
        <td>
            <select><option>Option</option></select>
        </td>

    </tr>
    <tr>
        <td>
            <textarea></textarea>
        </td>
    </tr>

    <tr>
        <td>
            <button>Button</button>
        </td>
    </tr>
    <tr>
        <td>
            <button type="submit">Button type="submit"</button>
        </td>
    </tr>

</table>
</form>
<div id="result"></div>


<script>


    var submitEl = $("td :submit")
      .parent('td')
      .css({background:"yellow", border:"3px red solid"})
    .end();
    
    $('#result').text('jQuery matched ' + submitEl.length + ' elements.');

    // so it won't submit
    $("form").submit(function () { return false; });
    
    // Extra JS to make the HTML easier to edit (None of this is relevant to the ':submit' selector
    $('#exampleTable').find('td').each(function(i, el) {
        var inputEl = $(el).children(),
            inputType = inputEl.attr('type') ? ' type="' + inputEl.attr('type') + '"' : '';
        $(el).before('<td>' + inputEl[0].nodeName + inputType + '</td>');
    })
    



</script>
</body>
</html>
演示: