useUnmount

组件卸载的时候执行

Usage

Live Editor

function Demo() {
  const [value] = useState("已挂载");
  useUnmount(() => {
    alert("已卸载");
  });
  return <div>{value}</div>;
};
Result

API

useUnmount

Returns

void

Arguments

参数名描述类型默认值
fn清理函数() => void (必填)-