js中net::ERR_FILE_NOT_FOUND报错的解决

 function bindData(data){
        console.log(data)
        //定义空字符串
        var str = "";
        //字符串拼接
        //同步课程
        str += `<li> <div class="top">
                    <span class="rj">${data.cont}</span>
                    <img src="${data.src}" alt="" class="m">
                    <p>${data.isFree ? `${data.num}人在学习`:` <span>${data.num}人已考试</span><span>${data.time}</span>`}</p>
                </div>
                <div class="bottom">
                    <div class="left">
                       ${data.isFree ? `<span>${data.title}</span>
                       <span class="time">${data.time}课时</span>`:` <span>${data.title}</span>`}
                    </div>
                    <div class="right">免费学习</div>
                </div></li>`
        return str;
    }

// 课程区域数据
var lesson = {
    online: [
        {
        title: '行政管理专业班1',
        src: './img/index/banner1.png',
        cont: '人教版',
        time: 23,
        isFree: true,
        num: 1100
    }, {
        title: '行政管理专业班2',
        src: './img/index/banner2.png',
        cont: '沪教版',
        time: 23,
        isFree: true,
        num: 1100
    }, {
        title: '行政管理专业班3',
        src: './img/index/banner3.png',
        cont: '人教版',
        time: 23,
        isFree: true,
        num: 1100
    }, {
        title: '行政管理专业班4',
        src: './img/index/banner4.png',
        cont: '人教版',
        time: 22,
        isFree: true,
        num: 1100
    }, {
        title: '行政管理专业班5',
        src: './img/index/banner5.png',
        cont: '沪教版',
        time: 33,
        isFree: true,
        num: 1100
    }, {
        title: '行政管理专业班7',
        src: './img/index/banner7.png',
        cont: '人教版',
        time: 44,
        isFree: true,
        num: 1100
    }, {
        title: '行政管理专业班6',
        src: './img/index/banner6.png',
        cont: '人教版',
        time: 33,
        isFree: true,
        num: 1100
    }, {
        title: '行政管理专业班8',
        src: './img/index/banner8.png',
        cont: '人教版',
        time: 44,
        isFree: true,
        num: 1100
    }]
}