javascript - What is the predefined focus() function that is available in Chrome? -



javascript - What is the predefined focus() function that is available in Chrome? -

today run unexpected when writing javascript in chrome (version 37). appears chrome has predefined focus variable available global. upon farther inspection via developer tools, i've found variable function:

> typeof focus "function"

does know function or does, or why global?

i had variable named focus , global messed in webapp. spent lastly hr debugging focus getting created , turned out chrome had predefined.

you talking

window.focus

makes request bring window front. may fail due user settings , window isn't guaranteed frontmost before method returns.

it built-in function, not reserved word open not name variable. other baddie naming submit button submit , trying submit form programatically

any variable defined in global scope may mess other window.xxxx vars/functions.

more window functions.

javascript google-chrome predefined-variables

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