https://www.cnblogs.com/zhangjd/p/7884603.html
Bootstrap：弹出框和提示框效果以及代码展示
https://www.cnblogs.com/cpcpc/p/7233898.html
http://v3.bootcss.com/javascript/#modals
bootstrap 需要引用什么
https://zhidao.baidu.com/question/534569909.html?qbl=relate_question_3&word=bootstrap%20%D0%E8%D2%AA%D2%FD%D3%C3%CA%B2%C3%B4
bootstrap 下载
http://v3.bootcss.com/getting-started/#download
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