为什么现在不返回unionId了？多了个expires_in: 7200,好像回到旧的体系了。原来绑定过并能得到unionId,今天重新登录后台服务器收不到unionId了。

新装64位win10开发工具，扫码确认后报socket hang up不能登录。

Mon Mar 06 2017 21:23:21 GMT+0800 (CST) 渲染层错误 VM833:2 TypeError: Cannot read property '{{index}}' of null     at wfor (1040390443.debug.open.weixin.qq.com/pages/index/index.html:526)     at _2 (1040390443.debug.open.weixin.qq.com/pages/index/index.html:610)     at m10 (1040390443.debug.open.weixin.qq.com/pages/index/index.html:2063)     at 1040390443.debug.open.weixin.qq.com/pages/index/index.html:3847     at b (1040390443.debug.open.weixin.qq.com/pages/index/index.html:28)     at k (1040390443.debug.open.weixin.qq.com/pages/index/index.html:28)     at 1040390443.debug.open.weixin.qq.com/pages/index/index.html:28(anonymous function) @ VM833:2 VM835:1 Mon Mar 06 2017 21:23:21 GMT+0800 (CST) 渲染层错误 VM835:2 webviewScriptError Cannot read property '{{index}}' of null TypeError: Cannot read property '{{index}}' of null     at wfor (http://1040390443.debug.open.weixin.qq.com/pages/index/index.html:526:75)     at _2 (http://1040390443.debug.open.weixin.qq.com/pages/index/index.html:610:1)     at m10 (http://1040390443.debug.open.weixin.qq.com/pages/index/index.html:2063:1)     at http://1040390443.debug.open.weixin.qq.com/pages/index/index.html:3847:1     at b (http://1040390443.debug.open.weixin.qq.com/pages/index/index.html:28:11610)     at k (http://1040390443.debug.open.weixin.qq.com/pages/index/index.html:28:12513)     at http://1040390443.debug.open.weixin.qq.com/pages/index/index.html:28:13257(anonymous function) @ VM835:2 VM836:1 Mon Mar 06 2017 21:23:21 GMT+0800 (CST) 渲染层错误 VM836:2 Uncaught TypeError: Cannot read property '{{index}}' of null 为什么wx:for允许空值？