<!DOCTYPE html> <html lang="ja"> <head> <meta charset="utf-8"> <title></title> <script src="index.js"></script> </head> <body> </body> </html> "use strict"; var isObject = function(value) { if ( (Object.prototype.toString.call(value) === '[object Object]') && (!Array.isArray(value)) && (value !== null) && (typeof value !== 'undefined') ) { return true; } return false; }; var check = function(a, b,