/**
* @desc SVG转PNG
* @param {Object} o 转入参数
* @param {Element} o.svg svg 节点
* @param {Number} o.scale 缩放
* @param {String} o.toDataType 输出数据类型 toDataURL||toBlob
* @param {Function} o.success 成功回调
* @param {Function} o.error 失败回调
*/
function svg2png(o) {
let svg = o.svg;
let scale = o.scale || 1;
let toDataType = o.toDataType || "toDataURL";
let success = o.success || function () { };
let error = o.error || function () { };
let svgData = new XMLSerializer().serializeToString(svg);
let canvas = document.createElement("canvas");
let svgSize = svg.getBoundingClientRect();
canvas.width = svgSize.width * scale;
canvas.height = svgSize.height * scale;
// canvas.style.width = svgSize.width;
// canvas.style.height = svgSize.height;
let ctx = canvas.getContext("2d");
ctx.scale(scale