判断类型(可以区分null和object)

type = para => {
  return Object.prototype.toString.call(para).match(/\[([^]*)\]/)[1].split(" ")[1]
}

type = para => {
  console.log(Object.prototype.toString.call(para))
  return Object.prototype.toString.call(para).match(/\[([^]*)\]/)[1].split(" ")[1]
}
console.log(type(null))//  //[object Null] Null
console.log(type({}))//[object Object] Object
console.log(type([]))//[object Array] Array