There is a chart instance already initialized on the dom.
时间: 2023-10-19 22:18:27 浏览: 49
To work with an existing chart instance initialized on the DOM, you can use the Chart.js library's `Chart` constructor to get a reference to the chart instance.
For example, if your chart is defined in a canvas element with an id of "myChart", you can get a reference to the chart instance as follows:
```javascript
var ctx = document.getElementById('myChart').getContext('2d');
var chartInstance = new Chart(ctx, options);
```
Here, `options` refers to the configuration options you used to create the chart initially. You can then use the `chartInstance` variable to manipulate the chart instance, such as updating its data or options.