javascript 判断数据类型 判空

function isNull_Undefined(obj) {  return obj===null|| obj === undefined;}function isArray(obj){  return !isNull_Undefined(obj)&&(typeof obj=='object')&&obj.constructor==Array;}function isString(str){  return !isNull_Undefined(str)&&(typeof str=='string')&&str.constructor==String;}function isNumber(obj){  return !isNull_Undefined(obj)&&(typeof obj=='number')&&obj.constructor==Number;}function isDate(obj){  return !isNull_Undefined(obj)&&(typeof obj=='object')&&obj.constructor==Date;}function isFunction(obj){  return !isNull_Undefined(obj)&&(typeof obj=='function')&&obj.constructor==Function;}function isObject(obj){  return !isNull_Undefined(obj)&&(typeof obj=='object')&&obj.constructor==Object;}function isNotEmptyString(str){  return isString(str) && str.length>0;}function isNotEmptyArray(obj){  return isArray(obj) && obj.length>0;}export {  isArray,  isString,  isNumber,  isDate,  isFunction,  isObject,  isNull_Undefined,  isNotEmptyString,  isNotEmptyArray,}