目的：
试了一下远程验证，试了好几次，得出小结，可以记录下，提醒以防绕路。
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1.引用js
2.demo的html
1 <form action="/user/save" method="post" class="form form-horizontal" id="form-member-add"> 2 ????????<div class="row cl"> 3 ????????????<label class="form-label col-xs-4 col-sm-3"><span class="c-red">*</span>用户名：</label> 4 ????????????<div class="formControls col-xs-8 col-sm-9"> 5 ????????????????<input type="text" class="input-text" placeholder="XXX" id="username" name="username"> 6 ????????????</div> 7 ????????</div> 8 </form> 9 <script type="text/javascript" src="lib/jquery.validation/1.14.0/jquery.validate.js"></script>10 <script type="text/javascript" src="lib/jquery.validation/1.14.0/validate-methods.js"></script>11 <script type="text/javascript" src="lib/jquery.validation/1.14.0/messages_zh.js"></script>12 <script type="text/javascript">13 $(function(){ ???14 ????$("#form-member-add").validate({15 ????????rules: {16 ????????????username: {17 ????????????????required: true,18 ????????????????minlength: 2,19 ????????????????maxlength: 8,20 ????????????????remote: {21 ????????????????????url: ‘/verifyUsername‘,22 ????????????????????type: ‘post‘,23 ????????????????????data: {24 ????????????????????????"name": function () {25 ????????????????????????????return $("input[name=‘username‘]").val();26 ????????????????????????}27 ????????????????????}28 ????????????????}29 ????????????}30 ????????},31 ????????messages: {32 ????????????username: {33 ????????????????required: ‘请输入用户名‘,34 ????????????????remote: ‘用户已存在‘35 ????????????}36 ????????},37 ????????onkeyup: false,38 ????????focusCleanup: true,39 ????????success: "valid",40 ????????submitHandler: function (form) {41 ????????????$(form).ajaxSubmit(function (data) {}); ???????????42 ????????}43 ????});44 });45 </script>??注意：这个地方很多人都会出现不行的问题，所以，注意第24行的data里面的“name”，要和后台程序接口的参数名一致，url后面不用加参数，js会自己拼接请求。
3.demo程序接口
1 ????@PostMapping("/verifyUsername")2 ????@ResponseBody3 ????public boolean verifyUsername(@RequestParam(value = "name",defaultValue = "") String name){4 ????????if(StringUtils.isNotEmpty(name)) {5 ????????????return userService.verifyUsername(name);6 ????????}7 8 ????????return false;9 ????}??注意：js只接受true和false
4.结果
只要第2条“注意”的内容知道了，基本上也就没什么问题了。
jquery.validate 远程验证remote使用详解
原文地址：https://www.cnblogs.com/DjangoBlogs/p/10043114.html