js 获取函数的所有参数名

// 获取函数的参数名
function getParameterName(fn) {
    if(typeof fn !== ‘object‘ && typeof fn !== ‘function‘ ) return;
    const COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
    const DEFAULT_PARAMS = /=[^,)]+/mg;
    const FAT_ARROWS = /=>.*$/mg;
    let code = fn.prototype ? fn.prototype.constructor.toString() : fn.toString();
    code = code
        .replace(COMMENTS, ‘‘)
        .replace(FAT_ARROWS, ‘‘)
        .replace(DEFAULT_PARAMS, ‘‘);
    let result = code.slice(code.indexOf(‘(‘) + 1, code.indexOf(‘)‘)).match(/([^\s,]+)/g);
    return result === null ? [] :result;
}