plainheart commented on issue #12823:
URL: 
https://github.com/apache/incubator-echarts/issues/12823#issuecomment-645986599


   @tikeyc 麻烦您使用所拥有的触屏或大屏显示器帮助验证以下问题:
   - `window.DocumentTouch && document instanceof DocumentTouch` 的结果是否为 `true`
   - `window` 对象中是否有 `ontouchstart` 函数
   
   
通过[StackOverflow](https://stackoverflow.com/questions/4817029/whats-the-best-way-to-detect-a-touch-screen-device-using-javascript)上的讨论,似乎很难有一种能适用于各种情况的方案。


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