index.js

/* eslint-disable */
/**
 * 节流函数
 */
export function debounce(func, wait, immediate) {
  let timeout, args, context, timestamp, result

  const later = function () {
    const last = +new Date() - timestamp  // 距上次触发事件间隔
    // 上次被包装函数被调用时间间隔 last 小于设定的时间间隔 wait
    if (last < wait && last > 0) {
      timeout = setTimeout(later, wait - last)
    } else {
      timeout = null;
      // 如果设定 immediate === true, 因为开始边界已经调用了此处无需调用
      if (!immediate) {
        result = func.apply(context, args)
        if (!timeout) context = args = null
      }
    }
  }
  return function (...args) {
    context = this
    timestamp = +new Date()
    const callNow = immediate && !timeout
    // 如果延时不存在, 重新设定超时
    if (!timeout) timeout = setTimeout(later, wait)
    if (callNow) {
      result = func.apply(context, args)
      context = args = null
    }

    return result
  }
}

/**
 * @param {object} json
 * @returns {string}
 */
export function param2(json) {
  if (!json) return ''
  return cleanArray(
    Object.keys(json).map(key => {
      if (json[key] === undefined ||
        json[key] === null
      ) return ''
      return encodeURIComponent(key) + '=' + json[key]
    })
  ).join('&')
}