fix bugs

core/static/script/base/checkAndRequest.coffee

@@ -1,5 +1,18 @@
 $ ->
-	$.fn.checkAndRequest = (url, callback, opts) ->
+	window.pageErrorHandle =
+		addError: (error) ->
+			$('#page-alert').append error
+
+		clearError: ->
+			$('#page-alert').find('button').nextAll().remove()
+
+		showError: ->
+			$('#page-alert').show()
+
+		hideError: ->
+			$('#page-alert').hide()
+
+	$.fn.checkAndRequest = (url, opts, callback, errorHandle) ->
 		defaults = {}
 
 		opts = $.extend defaults, opts
@@ -41,4 +54,5 @@ $ ->
 				url: url
 				method: 'post'
 				data: data
-				success: callback
+				success: callback
+				error: errorHandle

core/static/script/user/signup.coffee

@@ -1,9 +1,7 @@
 $ ->
   $('.signup-form').find('button').on 'click', (e) ->
     e.preventDefault()
-    $('.signup-form').checkAndRequest '/user/signup',(reply)->
-    	console.log reply
-    ,
+    $('.signup-form').checkAndRequest '/user/signup/',
     	username:
         check: /^[0-9a-z_]+$/
         error: '用户名必须以数字或小写字母开头'
@@ -14,3 +12,11 @@ $ ->
         check: ->
           $('#passwd').val() is $('#passwd2').val()
         error: '两次密码不一致'
+    , (reply) ->
+    	location.href = '/'
+    , (reply) ->
+    	if reply.status is 400
+    		error = reply.responseJSON.error
+    		pageErrorHandle.addError error
+    		pageErrorHandle.clearError()
+    		pageErrorHandle.showError()