import { onMounted, ref } from "vue"; import * as echarts from "echarts"; export default { mounted() { let myEcharts = echarts.init(this.$refs.mychart); let category = []; let dottedBase = +new Date(); let lineData = []; let barData = []; for (let i = 0; i < 20; i++) { let date = new Date((dottedBase += 3600 * 24 * 1000)); category.push( [date.getFullYear(), date.getMonth() + 1, date.getDate()].join('-') ); let b = Math.random() * 200; let d = Math.random() * 200; barData.push(b); lineData.push(d + b); } //第一个图表设置参数 myEcharts.setOption({ // backgroundColor: '#0f375f', tooltip: { trigger: 'axis', axisPointer: { type: 'shadow' } }, symbolRepeat: true, symbolSize: [12, 4], symbolMargin: 1, z: -10, data: lineData } ] }); }, }将这段代码改为vue3的写法
时间: 2024-04-22 20:24:01 浏览: 19
在Vue 3中,你需要使用`setup`函数来替代`mounted`钩子函数,并且使用`ref`来创建响应式数据。以下是将代码改写为Vue 3的写法:
```javascript
import { onMounted, ref } from "vue";
import * as echarts from "echarts";
export default {
setup() {
const mychart = ref(null);
onMounted(() => {
let myEcharts = echarts.init(mychart.value);
let category = [];
let dottedBase = +new Date();
let lineData = [];
let barData = [];
for (let i = 0; i < 20; i++) {
let date = new Date((dottedBase += 3600 * 24 * 1000));
category.push(
[date.getFullYear(), date.getMonth() + 1, date.getDate()].join('-')
);
let b = Math.random() * 200;
let d = Math.random() * 200;
barData.push(b);
lineData.push(d + b);
}
myEcharts.setOption({
tooltip: {
trigger: 'axis',
axisPointer: {
type: 'shadow'
}
},
symbolRepeat: true,
symbolSize: [12, 4],
symbolMargin: 1,
z: -10,
data: lineData
});
});
return {
mychart
};
},
};
```
在Vue 3中,我们使用`setup`函数来进行组件的初始化和响应式数据的创建。`onMounted`函数用于在组件挂载后执行代码。我们使用`ref`来创建一个响应式引用类型的数据`mychart`,并在`onMounted`函数内部使用`mychart.value`来访问引用的值。