1. ~function () {
    2.   const ENUM_KEY = {
    3.     isNumber: "Number",
    4.     isString: "String",
    5.     isBoolean: "Boolean",
    6.     isNull: "Null",
    7.     isUndefined: "Undefined",
    8.     isObject: "Object",
    9.     isArray: "Array",
    10.     isFunction: "Function",
    11.     isReg: "RegExp",
    12.     isDate: "Date"
    13.   }
    15.   function isType (type) { // type String
    16.     const reg = new RegExp("^\\[object " +type+ "\\]$", "i");
    17.     return (value) => {
    18.       return reg.test(Object.prototype.toString.call(value));
    19.     };
    20.   };
    22.   const check = {};
    23.   for (const key in ENUM_KEY) {
    24.     if (ENUM_KEY.hasOwnProperty(key)) {
    25.       check[key] = isType(ENUM_KEY[key]);
    26.     }
    27.   }
    28.   window.$t = check;
    29. }();
    31. $t.isObject({}) // true