Merge branch 'release/5.3' into 'gray'

Release/5.3

增加标志调整请求速度

See merge request !28

@@ -16,6 +16,7 @@ var Captcha = function(container, options) {
     this.picWidth = null;
     this.$tip = null;
     this.refreshCb = null;
+    this.running = false;
 
     return this;
 };
@@ -89,13 +90,19 @@ Captcha.prototype = {
         var self = this;
         var uri = this.refreshURI;
 
+        if (self.running) {
+            return $.Deferred().reject().promise(); // eslint-disable-line
+        }
+
+        self.running = true;
+
         return $.get(uri)
             .done(function(result) {
                 if (result.code !== 200) {
                     return self.showTip();
                 }
 
-                var src = result.data.images;
+                var src = result.data.images; // eslint-disable-line
 
                 self.render({
                     images: src
@@ -105,7 +112,9 @@ Captcha.prototype = {
 
                 self.refreshCb && self.refreshCb();
             })
-            .fail($.noop);
+            .always(function() {
+                self.running = false;
+            });
     },
 
     onRefresh: function(cb) {