1.仿照代码重写了原usernameCheck的validator。重命名为remoteCSRF，用于使用ajax异步向服务器验证字段唯一性。参数为url：请求地址，field：向服务器发送的表示符名称；

2.添加了emailAddress的validator的requires.js的config.
[ci skip]

static/src/js/lib/formValidation/validator/remoteCSRF.js

@@ -0,0 +1,46 @@
+/**
+ * remoteCSRF validator
+ */
+(function(root, factory) {
+
+    "use strict";
+
+    // AMD module is defined
+    if (typeof define === "function" && define.amd) {
+        define("validator/remoteCSRF", ["jquery", "base", "csrf"], factory);
+    } else {
+        // planted over the root!
+        factory(root.jQuery, root.FormValidation);
+    }
+}(this, function ($, FormValidation, csrfHeader) {
+    FormValidation.I18n = $.extend(true, FormValidation.I18n || {}, {
+        'en_US': {
+            remoteCSRF: {
+                'default': ''
+            }
+        }
+    });
+    FormValidation.Validator.remoteCSRF = {
+        validate: function(validator, $field, options) {
+            var dfd   = new $.Deferred(), ajaxData = {};
+            ajaxData[options.field] = $field.val();
+            if ($field.val() === '')
+                return true;
+            var url     = options.url;
+            var xhr = $.ajax({
+                beforeSend: csrfHeader,
+                url: url,
+                dataType: 'json',
+                data: ajaxData,
+                method: "post"
+            });
+            xhr.success(function(response) {
+                dfd.resolve($field, 'remoteCSRF',{valid:!response.data, message:options.msg});
+            })
+            .error(function(response) {
+                dfd.resolve($field, 'remoteCSRF', {valid: false});
+            });
+            return dfd;
+        }
+    };
+}));

static/src/js/lib/formValidation/validator/usernameCheck.js

@@ -1,37 +0,0 @@
-/**
- * usernameCheck validator
- */
-(function(root, factory) {
-
-    "use strict";
-
-    // AMD module is defined
-    if (typeof define === "function" && define.amd) {
-        define("validator/usernameCheck", ["jquery", "base", "csrf"], factory);
-    } else {
-        // planted over the root!
-        factory(root.jQuery, root.FormValidation);
-    }
-}(this, function ($, FormValidation, csrfHeader) {
-    FormValidation.I18n = $.extend(true, FormValidation.I18n || {}, {
-        'en_US': {
-            usernameCheck: {
-                'default': 'Please input the same value'
-            }
-        }
-    });
-    FormValidation.Validator.usernameCheck = {
-        validate: function(validator, $field, options) {
-                    if ($field.val() == '')
-                        return true;
-                    return !$.ajax({
-                        async: false,
-                        beforeSend: csrfHeader,
-                        url: "/api/username_check/",
-                        data: {username: $field.val()},
-                        dataType: "json",
-                        method: "post",
-                    }).responseJSON.data;
-        }
-    };
-}));