添加事件的方法
https://www.jianshu.com/p/200b3c507673
https://blog.csdn.net/q764424567/article/details/89704063
自定义事件
https://blog.csdn.net/u011416077/article/details/48131821
脚本绑定事件
https://answers.unity.com/questions/854251/how-do-you-add-an-ui-eventtrigger-by-script.html
