Now the company wants to do IE 11 browser compatibility, what plug-ins or shortcut methods can solve this compatibility problem?

our previous code is adapted to Google and Firefox, but now it is required that the code is compatible with IE11 browsers. It is impossible for me to rewrite the code, is it? Is there any quick way to solve it as soon as possible? The
error is as follows:
Google and Firefox will not have such an error. Test that IE11 does not support ES6 syntax, but the final angular does not know what the error is.
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is there anything special that you won't be compatible with?
are all compatible with Google Firefox. Ie11 should not be a big problem

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b309c1-2aa70.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b309c1-2aa70.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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