提示信息优化

public/static/common/js/common.js

@@ -290,11 +290,12 @@ function FromInit(form_name)
 		// 错误
 		onInValid: function(validity)
 		{
+			var $this = this;
 			setTimeout(function()
 			{
 				// 错误信息
 				var $field = $(validity.field);
-				var msg = $field.data('validationMessage') || this.getValidationMessage(validity);
+				var msg = $field.data('validationMessage') || $this.getValidationMessage(validity);
 				if($field.hasClass('am-field-error'))
 				{
 					Prompt(msg);