delay [延迟]

在 wait 毫秒后调用提供的函数。

使用 setTimeout() 来延迟执行 fn。

使用扩展运算符 (...) 来向函数提供任意数量的参数。

typescript

const delay = (fn: Func, wait: number, ...args: any[]) =>
  setTimeout(fn, wait, ...args);

// Return a promise, Resolve after `wait` milliseconds.
const delayedPromise = (wait: number = 300, ...args: any[]) =>
  new Promise((resolve) => {
    delay(resolve, wait, ...args);
  });

typescript

delay(
  function (text) {
    console.log(text);
  },
  1000,
  "later"
); // Logs 'later' after one second.

// delayedPromise
let counter = 0;
const updateState = () => {
  counter++;
};
const debouncedUpdate = debounce(updateState);
debouncedUpdate(); // counter == 1
debouncedUpdate(); // counter == 1
await delayedPromise(); // counter == 1
assertEquals(counter, 1);