/*
    导出证书
*/

function showCertificate() {
    // 获取dom
    let certificateDom = document.querySelector('.box-certificate');
    certificateDom.style.display = certificateDom.style.display == "block" ? "none" : "block";

    let certificateNameDom = document.querySelector('.box-certificate-name>span');
    let classInfo = getClassInfo();
    certificateNameDom.innerText = classInfo.thank.name;

    let mainVideoDom = document.getElementById("mainVideo");
    mainVideoDom.pause();

    // 控制按钮展示
    const buttonDom = document.getElementsByClassName('box-btn')[0];
    buttonDom.style.display = 'none';
}

function exportCertificate() {
    // 获取dom
    let certificateDom = document.querySelector('.box-certificate');
    // 创建dom
    let canvas = document.createElement('canvas');
    let ctx = canvas.getContext('2d');
    // 设置dom尺寸
    canvas.width = certificateDom.offsetWidth;
    canvas.height = certificateDom.offsetHeight;

    // 调用 html2canvas 方法，创建一个下载链接，将dom转成base64下载
    html2canvas(certificateDom).then(function (canvas) {
        let imgData = canvas.toDataURL('image/png');
        let link = document.createElement('a');
        link.download = '鸣谢证书.png';
        link.href = imgData;
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);

        certificateDom.style.display = "none";
    });
}