How does jest specify the current ua information, such as specifying ua as a mobile device?

scenarios are as follows:

I wrote the code related to the end touch event, which determines whether to use the touch event or the mouse event according to ua and ("touchstart" in window)).

but when testing jest, the default ua is PC. How to change ua to mobile?

Javascript vue.js react.js jest
Sep.27,2021

has been solved. Ask and answer yourself
configure
clipboard.png

in jest.config as follows

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MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf3704-54ad7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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