js-wrench/dist/modules/isUndefined.js

JS函数库

import { toString } from './init';
/**
 * @description 是否 undefined
 *
 * @param {*} v 任意值
 * @return {*}  {boolean} 返回一个布尔值
 * @example isUndefined(null) => false
 */
const isUndefined = (v) => {
    return toString.call(v) === '[object Undefined]';
};
export default isUndefined;