js将远程跨域图片连接转换成base64格式亲测可用

网上找了很多方法，要么说JS不能转，要么就是转换不了，以下是找到的完美的解决方法，

functionconvertImgToBase64(url, callback, outputFormat){

varcanvas = document.createElement('CANVAS'),

ctx = canvas.getContext('2d'),

img =newImage;

img.crossOrigin ='Anonymous';

img.onload =function(){

canvas.height = img.height;

canvas.width = img.width;

ctx.drawImage(img,0,0);

vardataURL = canvas.toDataURL(outputFormat ||'image/png');

callback.call(this, dataURL);

canvas =null;

};

img.src = url;

}

convertImgToBase64('http://bit.ly/18g0VNp',function(base64Img){

// Base64DataURL

alert(basearr[1]);

});