vue 图片下载

getBase64Image(img) {

var canvas = document.createElement("canvas");

canvas.width = img.width;

canvas.height = img.height;

var ctx = canvas.getContext("2d");

ctx.drawImage(img, 0, 0, img.width, img.height);

var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();

var dataURL = canvas.toDataURL("image/"+ext);

return dataURL;

} ,

// 图片下载

downloadFild(fild) {

let _this=this

var image = new Image();

image.src = fild.images;

image.setAttribute("crossOrigin", "anonymous");

image.onload = function(){

var base64 =_this.getBase64Image(image);

console.log(base64)

var a = document.createElement('a')

a.download = fild.certName || 'pic'

// 设置图片地址

a.href =base64

a.click();

}

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