小编use*_*249的帖子

为什么我的代码不能将我的图表保存为图像？我某处有错吗？虽然我按照源(在网上找到),我仍然无法解决我的问题.

我可以显示图表,但只有问题是无法保存为图像.

<script type="text/javascript" src="js/jsapi.js"></script>
    <script type="text/javascript">
    function saveAsImg(chartContainer, pngfilename) {
    var chartArea = chartContainer.getElementsByTagName('svg')[0].parentNode;
    var svg = chartArea.innerHTML;
    var doc = chartContainer.ownerDocument;
    var canvas = doc.createElement('canvas');
    canvas.setAttribute('width', chartArea.offsetWidth);
    canvas.setAttribute('height', chartArea.offsetHeight);
    canvas.setAttribute(
    'style',
    'position: absolute; ' +
    'top: ' + (-chartArea.offsetHeight * 2) + 'px;' +
    'left: ' + (-chartArea.offsetWidth * 2) + 'px;');
    doc.body.appendChild(canvas);
     canvg(canvas, svg);
    var data = canvas.toDataURL("image/png");
    canvas.parentNode.removeChild(canvas);
    data = data.substr(data.indexOf(',') + 1).toString();

    var dataInput = document.createElement("input") ;
    dataInput.setAttribute("name", 'imgdata') ;
    dataInput.setAttribute("value", data);

    var nameInput = …