折线图实时刷新数据怎么让X轴的时间线跟着平移🤔 [QUESTION]

### 🐛 Question description [Please make everyone to understand it]

### 💻 Link to minimal reproduction

Please provide a link by forking these links [g2plot](https://codesandbox.io/s/g2plot-reproduction-template-gyej1) or GitHub repo. What is a minimal reproduction, and why is it required?

### 🏞 Expected result

### 🚑 Any additional [like screenshots]

* **G2Plot Version**:
* **Platform**:

The issue provides no reproduction, source file, entry point, or test, and its expected result is empty. First obtain a minimal G2Plot reproduction and clarify the intended real-time X-axis behavior; done would require a confirmed fix or documented usage path plus a regression test if a library change is needed.

Written by the indexing model from the issue text.