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Add note on bug with .index() before 1.9 #582

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Add note on bug with .index() before 1.9 #582

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3 changes: 2 additions & 1 deletion page/using-jquery-core/understanding-index.md
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Expand Up @@ -38,7 +38,8 @@ console.log( "Index: " + div.first().index() ); // 0

In the first example, `.index()` gives the zero-based index of `#foo1` within its parent. Since `#foo1` is the second child of its parent, `index()` returns 1.

When `.index()` is called on a jQuery object that contains more than one element, it calculates the index of the first element.

__Note__: Before jQuery 1.9, `.index()` only worked reliably on a single element, which is why we've used `.first()` on each of our examples. In jQuery 1.9+ this can be ignored, as the API was updated to define that it operates on the first element only.

## `.index()` with a String Argument

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