jQuery是一种常见的JavaScript库，用于简化HTML文档遍历、事件处理、动画以及Ajax等操作。在此库中，jQuery选择器非常重要，可以轻松地定位HTML元素，实现交互和表单操作。以下是一些常见的jQuery选择器，可以帮助您定位HTML元素。

// 通过元素名定位$("button")$("input")$("form")// 通过id定位$("#submit_button")$("#username_input")// 通过class定位$(".container")$(".form_input")// 通过属性定位$("input[type=text]")$("a[href^=http]")// 通过父子关系定位$("form input")$(".container > div")

使用jQuery选择器后，您可以进行许多与表单相关的操作。例如，可以使用.val()方法获取或设置、或<select>元素的值。此外，您可以在表单提交时使用事件处理程序来验证并处理输入数据。</p><pre>// 获取和设置表单值var username = $("input[name=username]").val();$("textarea[name=comment]").val("Default comment");// 阻止表单提交并处理数据$("form").submit(function(e) {e.preventDefault(); // 阻止默认提交行为// 验证表单数据var username = $("input[name=username]").val();var password = $("input[name=password]").val();if (username === "" || password === "") {alert("Please fill in all fields.");} else {// 处理表单数据$.ajax({// ...});}});</pre><p>通过使用jQuery选择器和表单操作，您可以轻松地操纵HTML元素和表单数据，从而改进用户体验并提高网站的交互性。</p><p><img src="https://www.w4m.cn/uploadfile/www.w4m.cn/12/236352.jpg" alt="jquery选择器按钮 表单"></p> <script> show2(); </script> </article> <footer class="entry-meta"> <div class="shareBox clearfix"> <p><a href="javascript:;" class="sharebtn pay-author"><i class="fa fa-gift"></i> 打赏</a> <a href="javascript:;" class="sharebtn sharebtntn"><i class="fa fa-mail-forward (alias)"></i> 分享</a> </p> <div class="socialBox"> <div 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