说明：  增加了a.adjustOrder 属性，可以设置是否可以拖动条目，手动排序列表 增加了a.deleteAllShow 属性，可以设置是否显示清空按钮，可以清空列表 增加了challs_flash_deleteAllFiles() JAVASCRIPT函数，主要是清空按钮点击时，出发事件，根据返回值来确定是否清空列表 修改challs_flash_FormData(a) JAVASCRIPT函数，解决了获取表单多个NAME项相同的checkbox的值的问题
(Added a.adjustOrder property, you can set whether to drag entries, manually sort list Added a.deleteAllShow property, you can set whether to display the empty button, you can clear the list Added JAVASCRIPT () challs_flash_deleteAllFiles function, mainly to empty the button when the event, according to the return value to determine whether the empty list Modify the JAVASCRIPT (a) challs_flash_FormData function to solve the problem of getting the same value of the same checkbox as the NAME item in the form)