1. Would like to send data to add to the FormData in (using XMLHttpRequest must add data to the FormData or it will protect the wrong)
2. A new XMLHttpRequest out
3. Use the open method to specify the way to request (post or get) and URL
4. Set the callback method
5. The most important step: use the send method (data is stored in the FormData inside the parentheses) to send data
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