javascript中一些util方法汇总

/***************原生对象工类方法****************//** * 判断非空 * @param obj * @returns {boolean} */function isEmpty(obj) {  if (obj == undefined || obj == null || new String(obj).trim() == '') {    return true;  } else {    return false;  }}/** * 判断非空 * @param obj * @returns {boolean} */function isNotEmpty(obj) {  return isEmpty(obj) ? false : true;}/** * 获取字符串真实长度 汉字算两位 * @param str * @returns {number} */var getRealLength = function (str) {  return isEmpty(str) ? 0 : str.replace(/[^/x00-/xff]/g, "**").length;}var class2type = {}, toString = Object.prototype.toString;(function () {  var typeArr = "Boolean,Number,String,Function,Array,Date,RegExp,Object".split(",");  for (var i = 0; i < typeArr.length; i++) {    var name = typeArr[i];    class2type["[object " + name + "]"] = name.toLowerCase();  }})()/** * 判断参数类型 * @param obj * @returns {string} */function type(obj) {  return obj == null ? String(obj) : class2type[toString.call(obj)] || "object";}/** * 判断参数是否为布尔类型 * @param obj * @returns {boolean} */function isBoolean(obj) {  return isEmpty(obj) ? false : type(obj) === 'boolean';}/** * 判断参数是否为数字类型 * @param obj * @returns {boolean} */function isNumeric(obj) {  return isEmpty(obj) ? false : type(obj) === 'number';}function isString(obj) {  return isEmpty(obj) ? false : type(obj) === 'string';}function isFunction(obj) {  return isEmpty(obj) ? false : type(obj) === 'function';}function isArray(obj) {  return isEmpty(obj) ? false : type(obj) === 'array';}function isDate(obj) {  return isEmpty(obj) ? false : type(obj) === 'date';}function isRegExp(obj) {  return isEmpty(obj) ? false : type(obj) === 'regexp';}function isObject(obj) {  return isEmpty(obj) ? false : type(obj) === 'object';}