怎么把图片转换成base64位编码并且显示到html

 function 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;
        }
        var imgLink = "你的链接";
        var tempImage = new Image();
        tempImage.src = imgLink;
        tempImage.crossOrigin = "*";
        tempImage.onload = function(){
            var base64 = getBase64Image(tempImage);
            console.log(base64);
        }

navigator.getUserMedia的判断回掉里面要改成
video.src=stream
===>
video.src=URL.createObjectURL(stream)

而且我的canvas里好像有图片。。。我是用我定义的context还是用canvas

https://download.csdn.net/download/sammy520/9879474

http://imgbase64.duoshitong.com/
这个能直接转换的