说明：  一个用于WEB应用程序开发的前台HTML控件，在一个下拉列表框中显示多列多行信息，并可以对所列值进行多选。本人曾经想在网上找到类似的东西没有如愿，因此自己设计了一个，技术不一定复杂，但非常实用。
(A WEB application development for the future of HTML controls, in a drop-down list box to display multiple columns and more rows of information, and can choose more than the listed value. I have tried to find similar things online is not that way, so his design of a technology is not necessarily complicated, but very practical.)