useUnmount

組件卸載的時候執行

Usage

Live Editor

function Demo() {
  const [value] = useState("已掛載");
  useUnmount(() => {
    alert("已卸載");
  });
  return <div>{value}</div>;
};
Result

API

useUnmount

Returns

void

Arguments

參數名描述類型預設值
fn清理函数() => void (必填)-