目录引言IFNULL()语法：功能：用途：示例：使用场景：NULLIF()语法：功能：用途：示例：使用场景：区别总结使用建议引言
I\'m trying to create a b开发者_如何学运维utton that will move the currently selected OPTION in a SELECT MULTIPLE list to the top of that list. I currently have OptionTransfer.js implemented, which is
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