I would like to ask why the last instance2.test result in the following set of prototype chain code is h _ 1, br, h _ 2, h _ 3, and h _ 4?
hasn"t an h5 already been push before
? 
I would like to ask why the last instance2.test result in the following set of prototype chain code is h _ 1, br, h _ 2, h _ 3, and h _ 4?
hasn"t an h5 already been push before
?
test is an instance attribute of the subclass SubType . When var instance2=new SubType () , assign test of instance2 to ["H1", "H2", "h3", "h4"] . Similarly, when you instance1.test.push , you also modify the instance properties of instance1 .
when you visit instance2.name , you can't find the instance property. Then go to the prototype chain and find that SubType.prototype has the attribute name , so return it. Similarly, instance1.name.push also modifies the name attribute of the prototype chain SubType.prototype .
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Code: <script> function Dog(){} var dog = new Dog(); var dog1 = Object.create(dog); console.log(dog1._proto_); console.log(Object.getPrototypeOf(dog1)); < script> ...