Maybe added to the el-dialog properties:
:close-on-press-escape="false" :close-on-click-modal="false"
Effect: the keyboard, press the Esc key or mouse click outside the dialog, dialog will not be closed.
PS：
Vue attribute the difference between whether a colon:
Colon, indicating that the latter is a variable or expression; colon is not behind a string literal corresponding!
In particular Boolean type of confusion. For example dialog above examples, a colon indicates that the following property is a Boolean, or simply string.