diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1858f38..288ab45 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,13 @@
 
+# v3.1.0 未正式发布
+
+* 去除type:2时如果content未填写而弹出layer官网的默认设置
+* 修复layer.js 未设置btnAlign时,包裹按钮的div.layui-layer-btn  出现一多余class（Merge pull request from meihangbo/patch-2）
+
+
+---
+
+
 # v3.0.3 2017.03.06
 
 * 增加参数 isOutAnim，用于控制是否显示关闭动画，true 或者 false
diff --git a/src/layer.js b/src/layer.js
index fc409c8..0cc4e0d 100644
--- a/src/layer.js
+++ b/src/layer.js
@@ -232,7 +232,7 @@ Class.pt.vessel = function(conType, callback){
         for(var i = 0, len = config.btn.length; i < len; i++){
           button += '<a class="'+ doms[6] +''+ i +'">'+ config.btn[i] +'</a>'
         }
-        return '<div class="'+ doms[6] + ((config.btnAlign&&config.btnAlign.length>0)? (' layui-layer-btn-' + config.btnAlign) : ' ') +'">'+ button +'</div>'
+        return '<div class="'+ doms[6] + (config.btnAlign ? (' layui-layer-btn-' + config.btnAlign) : '') +'">'+ button +'</div>'
       }() : '')
       + (config.resize ? '<span class="layui-layer-resize"></span>' : '')
     + '</div>'
@@ -270,7 +270,7 @@ Class.pt.creat = function(){
       layer.closeAll('dialog');
     break;
     case 2:
-      var content = config.content = conType ? config.content : [config.content||'http://layer.layui.com', 'auto'];
+      var content = config.content = conType ? config.content : [config.content, 'auto'];
       config.content = '<iframe scrolling="'+ (config.content[1]||'auto') +'" allowtransparency="true" id="'+ doms[4] +''+ times +'" name="'+ doms[4] +''+ times +'" onload="this.className=\'\';" class="layui-layer-load" frameborder="0" src="' + config.content[0] + '"></iframe>';
     break;
     case 3: