如何获得 lazyload 的图片的宽度？

图片糊了...

function imgLoad(url, callback){
var image = new Image();
image.src = url;
if(image.readyState){
image.onreadystatechange = function(){
if(image.readyState === 'loaded' || image.readyState === 'complete'){
image.onreadystatechange = null;
callback(image.width,image.height);
}
};
}else{
image.onload = function(){
if(image.complete){
callback(image.width,image.height);
}
};
}
}