js instanceof用法

在JavaScript中，instanceof是用来判断一个对象是否是某个构造函数的实例化对象的。它的使用方法是通过左侧对象使用instanceof关键字，后面跟上右侧的构造函数。如果左侧对象在其原型链上能够找到右侧构造函数的原型对象，那么返回true，否则返回false。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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