text: export function isExist (obj) {
    return typeof obj !== 'undefined' && obj !== null
  }
  
  export function isFunction (obj) {
    return typeof obj === 'function'
  }
  
  export function isNumber (obj) {
    return typeof obj === 'number'
  }
  
  export function isString (obj) {
    return typeof obj === 'string'
  }
  
  export function isBoolean (obj) {
    return typeof obj === 'boolean'
  }
  
  export function isPromiseSupported () {
    return typeof window !== 'undefined' && isExist(window.Promise)
  }
  