<html> <head> <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script> </head> <body> <div id="wrap"> <input type="radio" name="payMethod" value="1" />支付宝 <input type="radio" name="payMethod" checked value="2" />微信 </div> <script> /** 获取被选中按钮的值 **/ var val_payPlatform = $('#wrap input[name="payMethod"]:checked ').val(); console.log(val_payPlatform); alert(val_payPlatform); </script> </body> </html>