for example, how can I switch to this version with ES3,?
for example, how can I switch to this version with ES3,?
js is backward compatible. You can just use it without switching
running environment?
if it's a client-side js, what the user uses is the environment;
if it's a server-side js, that's backward compatible, you can also run ES3 things under ES2017.
do you want to change the running environment? Install IE 5 6 7 8 9 10?
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