解决setup项目中引用echarts出的现“There is a chart instance already initialized on the dom.”警告的问题
时间: 2023-10-19 11:00:29 浏览: 50
在Vue 3中,使用echarts时可能会遇到"There is a chart instance already initialized on the dom."这个警告。要解决这个问题,可以按照以下方法进行操作:
1. 在初始化之前,先判断echarts实例是否存在,若存在,则先销毁该实例。可以使用ref来创建虚拟DOM引用,并在使用时使用`refName.value`来引用。具体代码如下:
```javascript
import { ref, onMounted } from 'vue';
import * as echarts from 'echarts';
setup() {
const main = ref();
onMounted(() => {
init();
});
let myChart;
const init = () => {
// 初始化之前先判断该实例是否存在,若存在,则先销毁
if (myChart != null && myChart != "" && myChart != undefined) {
myChart.dispose(); // 销毁
}
// 基于准备好的dom,初始化echarts实例
myChart = echarts.init(main.value);
var option = {
// ...
};
option && myChart.setOption(option);
};
return {
init,
main
};
}
```
2. 另一种解决方法是,在初始化之前,通过`echarts.getInstanceByDom`方法判断该echarts实例是否存在,若不存在,则进行初始化。具体代码如下:
```javascript
import { ref } from 'vue';
import * as echarts from 'echarts';
const barEchartRef = ref();
let barEchart = null;
function barEchartInit() {
let barOptions = {};
let hasEchart = echarts.getInstanceByDom(barEchartRef.value);
if (!hasEchart) {
barEchart = echarts.init(barEchartRef.value);
}
barEchart.setOption(barOptions, true);
}
```
总结起来,主要解决方法有两种:
1. 利用ref来创建虚拟DOM引用,在初始化之前先判断echarts实例是否存在,若存在则先销毁,然后再进行初始化。
2. 使用`echarts.getInstanceByDom`方法判断echarts实例是否存在,若不存在则进行初始化。
希望以上解决方法能够帮助到您解决"There is a chart instance already initialized on the dom."这个警告的问题。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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