/**
 * @param {Array} arr1
 * @param {Array} arr2
 * @description 得到两个数组的并集, 两个数组的元素为数值或字符串
 */
export const getUnion = (arr1:Array<string>, arr2:Array<string>) => {
  return Array.from(new Set([...arr1, ...arr2]))
}

/**
 * @param {*} obj1 对象
 * @param {*} obj2 对象
 * @description 判断两个对象是否相等，这两个对象的值只能是数字或字符串
 */
export const objEqual = (obj1 : any, obj2 : any) => {
  const keysArr1 = Object.keys(obj1)
  const keysArr2 = Object.keys(obj2)
  if (keysArr1.length !== keysArr2.length) return false
  else if (keysArr1.length === 0 && keysArr2.length === 0) return true
  /* eslint-disable-next-line */
  else return !keysArr1.some(key => obj1[key] != obj2[key])
}

export const forEach = (arr : Array<any>, fn : Function) => {
  if (!arr.length || !fn) return
  let i = -1
  let len = arr.length
  while (++i < len) {
    let item = arr[i]
    fn(item, i, arr)
  }
}

/**
 * @param {Array} target 目标数组
 * @param {Array} arr 需要查询的数组
 * @description 判断要查询的数组是否至少有一个元素包含在目标数组中
 */
export const hasOneOf = (targetarr : Array<any>, arr : Array<any>) => {
  return targetarr.some(_ => arr.indexOf(_) > -1)
}

/**
 * @description 绑定事件 on(element, event, handler)
 */
export const on = (function () {
  if ((document as any).addEventListener) {
    return function (element : any, event : any, handler : any) {
      if (element && event && handler) {
        element.addEventListener(event, handler, false)
      }
    }
  } else {
    return function (element : any, event : any, handler : any) {
      if (element && event && handler) {
        element.attachEvent('on' + event, handler)
      }
    }
  }
})()

/**
 * @description 解绑事件 off(element, event, handler)
 */
export const off = (function () {
  if ((document as any).removeEventListener) {
    return function (element : any, event : any, handler : any) {
      if (element && event) {
        element.removeEventListener(event, handler, false)
      }
    }
  } else {
    return function (element : any, event : any, handler : any) {
      if (element && event) {
        element.detachEvent('on' + event, handler)
      }
    }
  }
})()