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If you have a script manager and you want to download some script without installing it, this script will help
< 脚本 GreasyFork: download script button 的反馈
I don't understand this. What's the purpose of the promise?
I guess you've meant that older implementations of the GM.xmlHttpRequest do not return a promise, so the script won't work. This should be fixed now
const response = await GM.xmlHttpRequest({...});
to
const response = await new Promise((resolve, reject) => {
...