如何将highcharts生成的图片转化base64发送后端

1. 下载 canvg.js 我的百度网盘js工具有如有需要请咨询
2. 导入文件

   <script src="../zui/lib/jquery/jquery.js"></script>
 <script src="Highcharts-6.1.0/code/highstock.js"></script>
        <script src="Highcharts-6.1.0/code/modules/exporting.js"></script>
        <script src="Highcharts-6.1.0/code/modules/export-data.js"></script>
<script src="../zui/js/canvg.js"></script>

3. 在html中加入一个canvas画布div

<canvas id='canvasId' style='display: none'></canvas>

4. 在js中加入以下代码

var charData = $('#container_1').highcharts().getSVG();
                        canvg(canvasId, charData);
                         canvg(canvasId, charData);
                        function convertCanvas(canvas) {
                            var image = new Image();
                            image.src = canvas.toDataURL("image/png");
                            console.log(image)
                            return image
                        }
                        var imageData = convertCanvas(canvasId).src   // 生成了base64编码
                        console.log(imageData)
                    imgAjax(imageData)   // 发送ajax