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fix: typo error (#1087)
arr -> fruits
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1-js/05-data-types/05-array-methods/article.md

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@@ -262,8 +262,8 @@ alert( arr.includes(1) ); // true
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```js run
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let fruits = ['Apple', 'Orange', 'Apple'];
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alert( arr.indexOf('Apple') ); // 0(第一个 Apple)
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alert( arr.lastIndexOf('Apple') ); // 2(最后一个 Apple)
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alert( fruits.indexOf('Apple') ); // 0(第一个 Apple)
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alert( fruits.lastIndexOf('Apple') ); // 2(最后一个 Apple)
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```
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````smart header="方法 `includes` 可以正确的处理 `NaN`"

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