- 当前 Bug 的表现（可附上截图）

[non-writable] modification of global variable "wx.cloud" is not allowed when using plugins at app.json.

console.error

set @ WAService.js:4

(anonymous) @ WACloud.js:3

12:40:01.545 

- 预期表现

- 复现路径

- 提供一个最简复现 Demo