在Js中停止函数多次运行的最好方法是什么

function debounce(func, delay) {
  let timer;
  return function() {
    clearTimeout(timer);
    timer = setTimeout(func, delay);
  };
}

function debounce(func, delay, immediate) {
  let timer;
  return function() {
    const context = this;
    const args = arguments;
    clearTimeout(timer);
    if (immediate && !timer) {
      func.apply(context, args);
    }
    timer = setTimeout(function() {
      timer = null;
      if (!immediate) {
        func.apply(context, args);
      }
    }, delay);
  };
}

function throttle(func, delay) {
  let timer;
  return function() {
    const context = this;
    const args = arguments;
    if (!timer) {
      timer = setTimeout(function() {
        func.apply(context, args);
        timer = null;
      }, delay);
    }
  };
}

function throttle(func, delay) {
  let previous = 0;
  return function() {
    const context = this;
    const args = arguments;
    const now = Date.now();
    if (now - previous > delay) {
      func.apply(context, args);
      previous = now;
    }
  };
}