Function AS FIRST-CLASS OBJECTS

javascript中对象包含以下功能：

  • 可以作为变量被创建
  • 可以是变量，数组项，对象的属性
  • 可以作为函数的参数
  • 可以作为函数的返回值
  • 可以动态的为它创建属性值

函数具有以上所有的特点，因此说他是javascript的 FIRST-CLASS OBJECTS

注意一点：浏览器的事件处理是单线程的，每一个事件都被顺序的放置在队列中等待处理，遵循先进先出的原则，一个轮到他的事件是被处理，其他的事件必须要等待这个事件处理完，在单线程中，任何情况下都不会出现同时处理两个事件的情况

所有实例对象都继承自Object 原型对象,只有实例对象有__proto__属性，原型对象有prototype属性

时间： 2024-10-09 06:12:20

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