simpleui发布2021.4 修复N多问题，建议升级：
defb1fab(Resize and position the history button)
5a86f5e1(Resize the edit page button)
81cd2427(update element-ui to 2.15.1)
bee8b798(fix css bug)
77fea96a(fix css bug)
8c5ae6e3(Remove annotation)
28b9a188(update css)
1187cbb6(fix #336 and add infinite menu)
fc7ff00f(remove cdn)
7129f773(release 2021.4)
9a8d350c(add docker)
c1dfbf93(Merge pull request #345 from ydf/master)
6a55bdb8(Merge pull request #344 from CinFree/dev)
918b7998(删除build文件)
981f9471(增加menu.js)
0b0a7af2(Merge pull request #1 from RunningFaster/dev_iss)
87a39d4d(BUG修复，change_list action 选择全部进行删除时，form_data 内参数 select_across 换成 1)
a927fb63(修复静态资源路径)
f1703906(Merge remote-tracking branch 'upstream/dev' 合并分支 修复 选中一行后，点击导出按钮是删除的问题)
fecfe009(修改 .gitignore)
a94be932(修复 选中一行后，点击导出按钮是删除的问题)
gitee：
