<a  id="example1" onclick="exportGrid()" >导出图表</a>

//导出图表

      function exportGrid() {

          html2canvas($("#exportGrid"), {

              allowTaint: true,

              taintTest: false,

              onrendered: function (canvas) {

                  //canvas.id = "mycanvas";

                  //document.body.appendChild(canvas);

                  //生成base64图片数据

                  var url = canvas.toDataURL();

                  //以下代码为下载此图片功能

                  var triggerDownload = $("<a>").attr("href", url).attr("download", (new Date()).getTime() + "girds.png").appendTo("body");

                  triggerDownload[0].click();

                  triggerDownload.remove();

              }

          });

      }