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fix: 为输出补充示例
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docs/iterator.md

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@@ -745,6 +745,8 @@ for (var key of Object.keys(someObject)) {
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另一个方法是使用 Generator 函数将对象重新包装一下。
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```javascript
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const obj = { a: 1, b: 2, c: 3 }
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function* entries(obj) {
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for (let key of Object.keys(obj)) {
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yield [key, obj[key]];

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