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function myInstanceof(left, right) {
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    // 1.获取对象原型
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    let proto = Object.getPrototypeOf(left)
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    // 2.获取构造函数的prototype对象
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    let prototype = right.prototype
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    // 3.判断构造函数的prototype是否在该对象的原型链上
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    while(true) {
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        if(!proto)  return false
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        if(proto === prototype) return true
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        proto = Object.getPrototypeOf(proto)
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    }
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}