判断数组跟对象都返回object
console.log(typeof null); // "object"
console.log(typeof function () {
return 1;
}); // "function"
console.log(typeof '梦龙小站'); // "string"
console.log(typeof 1); // "number"
console.log(typeof a); // "undefined"
console.log(typeof undefined); // "undefined"
console.log(typeof []); // "object"
console.log(typeof NaN); // "number"
console.log(typeof {}); // "object"
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