IE不支持

系统：win 10
浏览器：IE 11
因为IE浏览器不支持Promise，所以有这个问题；
```
{description: "“Promise”未定义", message: "“Promise”未定义", name: "ReferenceEr...", number: -2146823279, stack: "ReferenceEr...", Symbol()_h.12o7nyldnb0: undefined, Symbol(react.element)_i.12o7nyldnb0: undefined}
```


Start by reviewing the IE 11 reproduction and the 19-comment discussion, focusing on the reported undefined Promise error in the Vue-based application. Done means the application no longer shows this error and the affected behavior works in IE 11; the issue does not name a file or test to run.

Written by the indexing model from the issue text.