uniapp引入插件市场echarts图表（l-echart）实现小程序端图表，并修改源码简化使用

使用的uniapp插件:`l-echart`

https://ext.dcloud.net.cn/plugin?id=4899

注意事项

1.因为小程序有主包分包大小限制，并且uni_modules中的包也会算在主包体积中，而我项目中的图表是在分包中使用的，所以我移动uni_modules中的l-echart图表组件到分包目录组件文件夹中
2.精简echarts.min.js体积，因为需求中只需要柱图和饼图，所以我去https://echarts.apache.org/zh/builder.html下载指定的 echarts 组件压缩包，然后替换l-echart中的echarts.min.js文件，只需要500kb左右大小

页面中的用法

<template><view class="charts-box"><l-echart ref="chart" @finished="init" class="charts-box"></l-echart></view>
</template><script>
import LEchart from "@/package-pc/pages/components/lime-echart/components/l-echart/l-echart.vue";
import * as echarts from "@/package-pc/pages/components/lime-echart/static/echarts.min.js";
import option from "@/package-pc/pages/monthreport/option";
export default {components: {LEchart,},data() {return {option: option,};},// 使用组件的finished事件里调用methods: {async init() {const chart = await this.$refs.chart.init(echarts);chart.setOption(this.option);},},
};
</script><style scoped>
/* 请根据实际需求修改父元素尺寸，组件自动识别宽高 */
.charts-box {width: 100%;height: 600px;
}
</style>

第一次尝试，修改`l-echart`源码，简化组件用法（不推荐用法）：

这样写有一个重大问题，uniapp不支持props传递的对象里面属性有function，而echarts这样的属性很多，所以不推荐这样修改源码，这里只是记录一下我尝试封装的思路过程

1.组件中直接引入echarts.min.js
2.props增加option传参
3.watch中监听option传参
4.mounted中直接执行init方法初始化图表
5.init方法中调用setOption方法
6.加入uni.onWindowResize方法监听宽高变化，然后调用原本就实现的resize方法

import * as echarts from "@/package-pc/pages/components/lime-echart/static/echarts.min.js";
export default {name: "lime-echart",props: {...option: {type: Object,},},watch: {option: {handler() {this.setOption(this.option);},deep: true,},},mounted() {this.$nextTick(() => {this.$emit("finished");this.init();});},methods:{...async init(...args) {// #ifndef APP-NVUE// if (arguments && arguments.length < 1) {//   console.error(//     "缺少参数：init(echarts, theme?:string, opts?: object, callback?: function)"//   );//   return;// }// #endif...this.chart = echarts.init(config.canvas,theme,Object.assign({}, config, opts));this.chart.setOption(this.option ?? {});uni.onWindowResize(() => {this.resize();});...},}

修改后的页面用法

直接传参option给组件，请求接口后修改option即可

<template><view class="charts-box"><l-echart :option="option1" class="charts-box"></l-echart></view>
</template><script>
import LEchart from "@/package-pc/pages/components/lime-echart/components/l-echart/l-echart.vue";
import option from "@/package-pc/pages/monthreport/option";
export default {components: {LEchart,},data() {return {option: option,};},// 修改option即可methods: {async setText() {this.option.title.text = "test"},},
};
</script><style scoped>
/* 请根据实际需求修改父元素尺寸，组件自动识别宽高 */
.charts-box {width: 100%;height: 600px;
}
</style>

第二次尝试，修改`l-echart`源码，简化组件用法（推荐用法）：

做的工作其实就是把echarts放在组件里面使用了，页面中就不用导入了，同时组件内部做了init初始化图表，页面中setOption就行了

import * as echarts from "@/package-pc/pages/components/lime-echart/static/echarts.min.js";
export default {name: "lime-echart",mounted() {this.$nextTick(async () => {await this.init();this.$emit("finished");});},methods:{...async init(...args) {// #ifndef APP-NVUE// if (arguments && arguments.length < 1) {//   console.error(//     "缺少参数：init(echarts, theme?:string, opts?: object, callback?: function)"//   );//   return;// }// #endif...this.chart = echarts.init(config.canvas,theme,Object.assign({}, config, opts));uni.onWindowResize(() => {this.resize();});...},}

修改后的页面用法

<template><view class="charts-box"><l-echartref="chart":option="option"@finished="init"class="charts-box"></l-echart></view>
</template><script>
import LEchart from "@/package-pc/pages/components/lime-echart/components/l-echart/l-echart.vue";
import option from "@/package-pc/pages/monthreport/option";
export default {components: {LEchart,},data() {return {option: option,};},// finished回调中设置option，接口请求图表数据也放在这里methods: {init() {this.$refs.chart.setOption(this.option);},},
};
</script><style scoped>
/* 请根据实际需求修改父元素尺寸，组件自动识别宽高 */
.charts-box {width: 100%;height: 600px;
}
</style>