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                ## jQuery代碼 ![mark](http://qiniu.newthink.cc/blog/20171213-164126724.gif) ``` <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="https://cdn.bootcss.com/jquery/1.11.3/jquery.js"></script> </head> <body> <ul> <li><input type="checkbox" name="test"/>看電視</li> <li><input type="checkbox" name="test"/>看電影</li> <li><input type="checkbox" name="test"/>上網</li> <li><input type="checkbox" name="test"/>爬山</li> <li><input type="checkbox" name="test"/>游樂場</li> <li><input type="checkbox" name="test"/>逛街</li> <li><input type="checkbox" name="test"/>聚會</li> </ul> <script type="text/javascript"> $('input[type=checkbox]').click(function () { if ($("input[name='test']:checked").length >= 4) { $(this).removeAttr("checked"); alert("最多選3個!"); } }); </script> </body> </html> ``` ## LayUI ![mark](http://qiniu.newthink.cc/blog/20171213-171523638.gif) ``` <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>select獲取自定義屬性值</title> <link rel="stylesheet" href="../layui/css/layui.css"/> </head> <body class="layui-form"> <input type="checkbox" lay-filter="test" name="test"/>看電視 <input type="checkbox" lay-filter="test" name="test"/>看電影 <input type="checkbox" lay-filter="test" name="test"/>上網 <input type="checkbox" lay-filter="test" name="test"/>爬山 <input type="checkbox" lay-filter="test" name="test"/>游樂場 <input type="checkbox" lay-filter="test" name="test"/>逛街 <input type="checkbox" lay-filter="test" name="test"/>聚會 <script src="../layui/layui.js"></script> <script> //一般直接寫在一個js文件中 layui.use(['layer', 'form', 'jquery'], function () { var layer = layui.layer , form = layui.form , $ = layui.jquery; form.on('checkbox(test)',function (data) { if ($("input[name='test']:checked").length >= 4) { $(data.elem).removeProp('checked'); //或者$(this) form.render(); alert("最多選3個!"); } }) }); </script> </body> </html> ``` ![mark](http://qiniu.newthink.cc/blog/20171213-171407060.png)
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