vs code language setting mode automatically detects

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Filename error detection, can be seen on the map js file does not have syntax highlighting, lower right corner of the display text is saved.
Then how do we set up back then, click on the bottom right of the text exist (here not only plain text may also be other format, which is the language problem automatically detected).

Click on this interface will appear after we turn opening the "profile association"

find the corresponding file format after the emergence of this interface, such is my js file as plain text by default, resulting in js syntax highlighting, then we are here after finding the point after js js file is linked to the JavaScript, we'll return to find the syntax highlighting. After setting even when the clicks or other files back again highlighted.