7.24
void
- 箭头函数的void用法
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/void
Non-leaking Arrow FunctionsSection
Arrow functions introduce a short-hand braceless syntax that returns an expression. This can cause unintended side effects by returning the result of a function call that previously returned nothing. To be safe, when the return value of a function is not intended to be used, it can be passed to the void operator to ensure that (for example) changing APIs do not cause arrow functions’ behaviors to change.
button.onclick = () => void doSomething();
This ensures the return value of doSomething changing from undefined to true will not change the behavior of this code.
上面所属 即箭头函数不想取其返回值的时候 可用void
- void 可代指未被操作的原始值
某种程度上来说void 0 === undefined
8.5
vue2.0貌似不能让localhost被占用才可以开启其他域名的网页？
