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);
});