建议用一个blur去一次数据库，去判断有没有这个用户 以及后台的一些简单的验证

<br> $(document).ready(function () {<br> var uname = $(&quot;#uname&quot;);<br> $(&quot;#uname&quot;).blur(function () {<br> if (uname.val().trim() == &quot;&quot;) {</p> <pre><code> return; } $.ajax({ type: &quot;Post&quot;, url: window.location.pathname + &quot;/CheckUName&quot;, data: JSON.stringify({ uname: uname.val().trim() }), contentType: &quot;application/json; charset=utf-8&quot;, dataType: &quot;json&quot;, //async:false, //同步 beforeSend: function () { }, //发送请求 success: function (data) { if (data.d) { XXXX.html(&quot;该用户名已存在&quot;); //uname.focus(); return; } else }, error: function (err) { alert(&quot;错误&quot; + err.responseText); } }); }); </code></pre>

```<br> $(document).ready(function () {<br> var uname = $(&quot;#uname&quot;);</p> <pre><code> $(&quot;#uname&quot;).blur(function () { if (uname.val().trim() == &quot;&quot;) { xx.html(&quot;请填写登录名&quot;); //uname.focus(); return; } $.ajax({ type: &quot;Post&quot;, url: window.location.pathname + &quot;/CheckUName&quot;, data: JSON.stringify({ uname: uname.val().trim() }), contentType: &quot;application/json; charset=utf-8&quot;, dataType: &quot;json&quot;, //async:false, //同步 beforeSend: function () { }, //发送请求 success: function (data) { if (data.d) { XX.html(&quot;该用户名已存在&quot;); //uname.focus(); return; } else // }, error: function (err) { alert(&quot;错误&quot; + err.responseText); } }); }); </code></pre> <pre><code> </code></pre>

看vs自带的asp.net mvc模板生成的AccountController代码