angular 5 convert image to base64

Question

I have a problem converting an image to base64, it converts well, but when I try to open with the base64 the image does not come out at all, I do not know what problem I have.

<img id="imageid" src="http://localhost:8000/media/db.png" alt="">

getBase64Image() {
    var data = document.getElementById("imageid");
    html2canvas(data).then(canvas => {  
        var imgconverted = canvas.toDataURL("data:image/jpeg;base64"); 
        console.log(imgconverted, 'base64');
    });  
}

this comes out as a result that supposedly is fine, but I open it in the browser and the image does not come out only a frame.

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAqQAAAG2CAYAAACpsJSkAAAXp0lEQVR4Xu3WwQkAMAwDsXb/oV3oEvdRFjCIPO5u23EECBAgQIAAAQIEIoErSCN5swQIECBAgAABAl9AkHoEAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBAQJD6AQIECBAgQIAAgVRAkKb8xgkQIECAAAECBASpHyBAgAABAgQIEEgFBGnKb5wAAQIECBAgQECQ+gECBAgQIECAAIFUQJCm/MYJECBAgAABAgQEqR8gQIAAAQIECBBIBQRpym+cAAECBAgQIEBAkPoBAgQIECBAgACBVECQpvzGCRAgQIAAAQIEBKkfIECAAAECBAgQSAUEacpvnAABAgQIECBA4AFcyNM5B/V48AAAAABJRU5ErkJggg==

I hope you can help me no matter what the problem is.

Answer 1

HTML2Canvas中当前存在图像错误： 链接到错误