js常用方法

function deepClone(source) {
  // 判断是否数组或对象
  if (source.constructor != Array && source.constructor != Object) {
    return source
  }
  const targetObj =  source.constructor === Array ? [] : {}
  for(let key in source) {
    // 判断是否为自身属性
    if (source.hasOwnProperty(key)) {
      if (source[key] && typeof source[key] === 'object') {
        // 数组或对象
        targetObj[key] = deepClone(source[key])
      } else {
        // 基本类型
        targetObj[key] = source[key]
      }
    }
  }
  return targetObj
}

function throttle(func, delay) {
  let lastCall = 0
  return function (...args) {
    const now = new Date().getTime()

    if (now - lastCall < delay) {
      return;
    }

    lastCall = now
    return func.apply(this, args)
  }
}

function debounce(func, delay) {
  let timeout

  return function (...args) {
    clearTimeout(timeout)
    timeout = setTimeout(() => {
      func.apply(this, args)
    }, delay)
  }
}