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Merge pull request xcatliu#8 from tangdw/patch-1
Update class.md
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advanced/class.md

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@@ -37,7 +37,7 @@ class Animal {
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this.name = name;
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}
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sayHi() {
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return `My name is ${name}`;
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return `My name is ${this.name}`;
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}
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}
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@@ -47,7 +47,7 @@ console.log(a.sayHi()); // My name is Jack
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### 类的继承
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使用 `extends` 关键字实现继承,子类中使用 `super` 表示父类的构造函数
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使用 `extends` 关键字实现继承,子类中使用 `super` 关键字来调用父类的构造函数和方法
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```js
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class Cat extends Animal {

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