# 方式一 ```js export const getObjType = obj => { var toString = Object.prototype.toString var map = { '[object Boolean]': 'boolean', '[object Number]': 'number', '[object String]': 'string', '[object Function]': 'function', '[object Array]': 'array', '[object Date]': 'date', '[object RegExp]': 'regExp', '[object Undefined]': 'undefined', '[object Null]': 'null', '[object Object]': 'object' } if (obj instanceof Element) { return 'element' } return map[toString.call(obj)] } ``` # 方式二