今天取请求返回值时报的一个错误，要取返回值中数组下标为零的数据，错误显示说未定义。检查之后发现要取的数据是请求返回的data中data，少嵌套了一层data导致数据为空报错。（返回数据的路径可以右键Copy property path，这样就不会错了）
- properties TypeError undefined reading Cannotproperties typeerror undefined reading properties undefined reading cannot properties typeerror reading cannot typeerror undefined property cannot properties typeerror undefined uncaught typeerror non-mysql undefined property typeerror undefined property webpack typeerror undefined uncaught property typeerror undefined property upgrade quot properties typeerror undefined