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

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-echart
            ref="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>