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Update solution.md
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1-js/07-object-oriented-programming/06-prototype-methods/2-dictionary-tostring/solution.md

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@@ -23,7 +23,7 @@ for(let key in dictionary) {
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}
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// 通过 toString 得到逗号分隔的属性值
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alert(dictionary); // "apple,__proto__"
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alert(dictionary.toString()); // "apple,__proto__"
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```
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当我们使用描述器创建一个属性,它的标识默认是 `false`。因此在以上代码中,`dictonary.toString` 是不可枚举的。

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