jQuery autocomplete plug-in modification_jquery

Mainly modified in two places:
1. Synchronization problem between up and down selection and input value.
After entering the keyword, when the drop-down option appears and you use the up and down keys of the keyboard to select, the value of the keyword input box is not synchronized with the value you selected. The plug-in was written by a foreigner, maybe he didn't take this into consideration.
2. Fixed the problem that automatic submission is not activated when inputting Chinese in Firefox.
Of course foreigners don’t know how to use Chinese input, so it’s natural that this bug exists.
Another: In the attachment, automatic submission after selection is implemented, which is exactly the same as that of Google and Baidu.
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