/**
* 判断是否是字符串
* @author xkloveme <xkloveme@gmail.com>
* @category is
* @alias is_string
* @param {any} value 任意值
* @returns {Boolean} 返回是否是字符串
*/
export default (value) => {
return Object.prototype.toString.call(value) === '[object String]';
};