vue 图片base64转化

import html2canvas from 'html2canvas'

html2canvas(canvasDom, options).then(canvas => {

//此时的图片是base64格式的，我们将图片格式转换一下

let type = 'png';

let imgData = canvas.toDataURL(type);

// 照片格式处理

let _fixType = function(type) {

type = type.toLowerCase().replace(/jpg/i, 'jpeg');

let r = type.match(/png|jpeg|bmp|gif/)0;

return 'image/' + r;

};

imgData = imgData.replace(_fixType(type), 'image/octet-stream');

let filename = this.row.name + '的二维码分享.' + type;

this.saveFile(imgData, filename);

})

saveFile(data, filename) {

let save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');

save_link.href = data;

save_link.download = filename;

let event = document.createEvent('MouseEvents');

event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);

save_link.dispatchEvent(event);

},