我通常这样做：

var image = new Image();
image.onload = function () {
   console.info("Image loaded !");
   //do something...
}
image.onerror = function () {
   console.error("Cannot load image");
   //do something else...
}
image.src = "/images/blah/foo.jpg";

请记住加载是异步的，所以你必须继续 onload 和 onerror 事件。

Remember that the loading is asynchronous so you have to continue the script inside the onload and onerror events.