function objectSize(the_object) { /* function to validate the existence of each key in the object to get the number of valid keys. */ var object_size = 0; for (key in the_object){if (the_object.hasOwnProperty(key)) { object_size++;} } return object_size;}用法如下:// Arbitrary objectvar something = { dog: "cat", cat: "dog"}console.log(objectSize(something));// Logs: 2希望本文所述对大家的javascript程序设计有所帮助。