bootstrap tree-view 如何在折叠菜单的时候修改图标?

https://img1.mukewang.com/5b9230e80001905e02850134.jpg技术用的是bootstrap的tree-view,下面是代码https://img1.mukewang.com/5b9231960001b92706000389.jpg,我之前也在onNodeCollapsed里面直接修改类,但是没有起作用,请问一下有什么办法解决?

leavens
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