一个判断js数据类型的函数

function judgetype(change) {
        if (arguments.length == 0) {
            return '0';//无参数传入
        }
        if (change === null) {
            return 'null'
        }
        if (change === undefined && arguments.length > 0) {
            return 'undefined'
        }
        if (change instanceof function) {
            return 'function'
        }
        if (change instanceof array) {
            return 'arry'
        }
        if (change instanceof number || typeof change == 'number') {
            return 'number'
        }
        if (change instanceof string || typeof change == 'string') {
            return 'string'
        }
        if (change instanceof boolean || typeof change == 'boolean') {
            return 'boolean'
        }
    }