[Vue warn]: Property or method “toJSON” is not defined on the instance but referenced during render.

报错：

[Vue warn]: Property or method “toJSON” is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. 
 

原因：

代码中有console.log(this.$route); 且开启了vconsole。

查找得知如果打印this或者window也会报错。

解决办法：

不用的时候把console.log注释掉

非要用的话，赋值给一个变量再打印。