ball-applet/pagesSchool/coaAdmin/stat/lecture.js

const app = getApp()
import * as echarts from '../../../commpents/ec-canvas/echarts'
let chart;
Page({
    data: {
        frameStyle: { useTop: true, name: '授课情况', leftArrow: true, useBar: false },
        xdata: [],
        // 学校
        zhSchool: '',
        school_id: '',
        schoolList: [],
    },
    // 返回
    back(e) {
        wx.navigateBack({ delta: 1 })
    },
    // 选择学校
    schoolChange: function (e) {
        const that = this;
        let data = that.data.schoolList[e.detail.value];
        if (data) {
            that.setData({ school_id: data.school_id });
            that.setData({ zhSchool: data.school_id_name });
        }
        that.watchLogin();
    },
    /**
     * 生命周期函数--监听页面加载
     */
    onLoad: async function (options) {
        const that = this;
        that.setData({ ec: { onInit: that.initChart } })
        // 监听用户是否登录
        await that.watchLogin();
    },
    // 监听用户是否登录
    watchLogin: async function () {
        const that = this;
        wx.getStorage({
            key: 'user',
            success: async res => {
                // 学校
                const school = await app.$get(`/rcs`, { coach_id: res.data.info.id });
                if (school.errcode == '0' && school.total > 0) {
                    that.setData({ schoolList: school.data })
                }
                if (that.data.school_id) {
                    const arr = await app.$get(`/statistics/coachLesson`, { school_id: that.data.school_id, coach_id: res.data.info.id });
                    if (arr.errcode == '0') {
                        that.setData({ xdata: arr.data })
                        const option = {
                            series: [{ data: arr.data }],
                        }
                        if (chart) chart.setOption(option)
                    }
                }
            },
            fail: async res => {
                wx.redirectTo({ url: '/pages/index/index' })
            }
        })
    },
    // 饼图
    initChart(canvas, width, height, dpr) {
        const that = this;
        var xdata = that.data.xdata;
        chart = echarts.init(canvas, null, { width: width, height: height, devicePixelRatio: dpr });
        canvas.setChart(chart);
        var option = {
            tooltip: { trigger: 'item' },
            legend: {
                orient: 'vertical',
                height: 40,
                padding: 50
            },
            series: [
                {
                    name: '授课情况',
                    type: 'pie',
                    radius: '50%',
                    data: xdata,
                    emphasis: {
                        itemStyle: { shadowBlur: 10, shadowOffsetX: 0, shadowColor: 'rgba(0, 0, 0, 0.5)' }
                    },
                    label: {
                        normal: {
                            show: true,
                            formatter: '{b}({c}节课)'
                        }
                    }
                }
            ]
        };
        chart.setOption(option, true);
        return chart;
    },
    /**
    * 生命周期函数--监听页面初次渲染完成
    */
    onReady: function () { },
    /**
     * 生命周期函数--监听页面显示
     */
    onShow: function () {
    },
    /**
     * 页面上拉触底事件的处理函数
     */
    /**
     * 生命周期函数--监听页面隐藏
     */
    onHide: function () {

    },

    /**
     * 生命周期函数--监听页面卸载
     */
    onUnload: function () {

    },

    /**
     * 页面相关事件处理函数--监听用户下拉动作
     */
    onPullDownRefresh: function () {

    },


    /**
     * 用户点击右上角分享
     */
    onShareAppMessage: function (res) {

    },
})