手写防抖节流

解释

防抖:高频触发后,n秒只执行一次 节流:高频触发后，n秒内只执行一次

防抖

function debounce(func, wait) {
  let timeout;
  return function() {
    let context = this;
    let args = arguments;
    if (timeout) clearTimeout(timeout);
    timeout = setTimeout(() => {
      func.apply(context, args);
    }, wait);
  };
}

节流

function throttle(fn, delay) {
  var prevTime = Date.now();
  return function() {
    var curTime = Date.now();
    if (curTime - prevTime > delay) {
      fn.apply(this, arguments);
      prevTime = curTime;
    }
  };
}