html2 canvas svg不能识别的解决方案

function showQRCode() {
                scrollTo(0, 0);
               
                if (typeof html2canvas !== 'undefined') {
                    //以下是对svg的处理
                    var nodesToRecover = [];
                    var nodesToRemove = [];
                    var svgElem = $("#divReport").find('svg');//divReport为需要截取成图片的dom的id
                    svgElem.each(function (index, node) {
                        var parentNode = node.parentNode;
                        var svg = node.outerHTML.trim();

                        var canvas = document.createElement('canvas');
                        canvg(canvas, svg); 
                        if (node.style.position) {
                            canvas.style.position += node.style.position;
                            canvas.style.left += node.style.left;
                            canvas.style.top += node.style.top;
                        }

                        nodesToRecover.push({
                            parent: parentNode,
                            child: node
                        });
                        parentNode.removeChild(node);

                        nodesToRemove.push({
                            parent: parentNode,
                            child: canvas
                        });

                        parentNode.appendChild(canvas);
                    });
                    html2canvas(document.querySelector("#divReport"), {
                        onrendered: function(canvas) {
                            var base64Str =canvas.toDataURL();//base64码，可以转图片

                            //...

                            $('<img>',{src:base64Str}).appendTo($('body'));//直接在原网页显示
                         }                     });                }            }