Selection：collapseToEnd() 方法
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
Selection.collapseToEnd() 方法会将选区折叠至选区中最后一个范围的末尾。如果选区内容处于焦点且可编辑，插入点（光标）将会在该位置闪烁。