判断JavaScript数据是否为空

getObjType = (obj) => {
    const type = Object.prototype.toString.call(obj)
    const array = type.split(/\s/g)
    return array[1].replace(']', '')
  }
 

isEmpty = (obj) => {
    const type = getObjType(obj)
    console.log('type', type)
    let flag = false
    switch (type) {
      case 'Null':
        flag = true
        break
      case 'Undefined':
        flag = true
        break
      case 'String':
        if (obj.trim() === '') {
          flag = true
        }
        break
      case 'Array':
        if (obj.length === 0) {
          flag = true
        }
        break
      default:
        flag = false
    }
    return flag
  }