ionic imgBase64

navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 70,        destinationType: destinationType.DATA_URL,targetWidth: 250,targetHeight: 250,correctOrientation:true });

function onPhotoDataSuccess(imageData) {
        saveImageToDB(imageData,1);
        smallImage1.style.display = 'block';
        smallImage1.src = "data:image/jpeg;base64," + imageData;
    }

var imagePath = "img/OBseverLOGO.png";
        function convertImgToBase64(url, callback, outputFormat){
            var canvas = document.createElement('CANVAS'),
                ctx = canvas.getContext('2d'),
                img = new Image;
            img.crossOrigin = 'Anonymous';
            img.onload = function(){
                canvas.height = img.height;
                canvas.width = img.width;
                ctx.drawImage(img,0,0);
                var dataURL = canvas.toDataURL(outputFormat || 'image/png');
                callback.call(this, dataURL);
                canvas = null;
            };
            img.src = url;
        }

        //这里的imagePath用你的图片路径来替换;


        convertImgToBase64(imagePath, function(base64Img){
            alert(base64Img.length);
        });