import * as echarts from '../../components/ec-canvas/echarts'
let chart = null


Page({
    data: {
        studentdata: {
            lazyLoad: true
        }, //折线图
        subject: '',
        term: [],
        point: []
    },


    onLoad: function () {
        this.echartsComponnet = this.selectComponent('#mathtest');
        this.getData(); //获取数据
    },
    getData: function () {
        this.setData({
                subject: '数学',
                term: [1, 2, 3, 4, 5, 6, ],
                point: [123, 125, 145, 136, 124, 142]
            }),
            this.initChart()
    },


    initChart: function () {
        this.echartsComponnet.init((canvas, width, height) => {
            const Chart = echarts.init(canvas, null, {
                width: width,
                height: height
            })
            Chart.setOption(this.getOption())
            return Chart
        })
    },
    getOption: function () {
        return {
            title: {
                left:'center',
                show:true,
                text:'数学' //this.data.subject,
            },
            xAxis: {
                name:'学期',
                data: this.data.term
            },
            yAxis: {
                name:'分数',
                type: 'value'
            },
            series: [{
                data: this.data.point,
                type: 'line'
            }]
        }
    }


})

同样的配置网页上试试能不能显示

改成数组试试

来个代码片段