当单击事件被触发时,当前行中的数据没有mxshow场,如此循环添加到域和指定错误。The currently clicked row cannot perform this operation, otherwise the details will not be displayed when the first click is taken.The following switch case statement guarantees the problem that the first click of mxShow is no value and the mxShow value switch.The value of item.iconChange is used to control the switchover of middle Font Icon. 当未显示细节时,图标向下,并且可以扩展代表。当显示细节时,图标向上,代表可以缩回。