react开发中发现的问题

报错：

src\pages\preventRender.jsx
Line 20:25: Expected an assignment or function call and instead saw an expression no-unused-expressions

Search for the keywords to learn more about each error.

webpack compiled with 1 error and 1 warning

原因是截图代码中语法写错了，这里应该是一个赋值或函数调用

正确的写法应该是如下：