反应 如何在React componentWillUnmount中取消订阅事件处理程序？

Question

How to solve these warnings from ESLint and make right unsubscription of event handlers below on componentWillUnmount in React 16x?

Line 137:  Expected an assignment or function call 
           and instead saw an expression  no-unused-expressions
Line 138:  Expected an assignment or function call 
           and instead saw an expression  no-unused-expressions

When try to unsubscribe from event listeners in React components:

componentWillUnmount() {
    this.handleClick === null;
    this.handleSubmit === null;
};

Answer 1

The inline event is never added to the dom, it only lives in React world. So there's nothing to actually unsubscribe from.. you can ignore the eslint rule in eslintrc.json by adding the following rule "no-unused-expressions": 0,