也许这会有所帮助：

currentimage.onload = function(e){
    // code, run after image load
}

如果需要等待图像加载，以下代码将加载下一个图像（currentIndex是你的img变量）：

If it is necessary to wait for the image to load, the following code will load the next image (currentIndex is your "img" variable):

var loadImages = function(imageURLarray, currentIndex){
    if (imageURLarray.length == 0 || imageURLarray.length == currentIndex) return false;
    if (typeof currentIndex == 'undefined'){
       currentIndex = 0;
    }
    // your top code
    currentimage.onload = function(e){
        // code, run after image load
        loadImages(imageURLArray, currentIndex++);
    }
}

而不是for循环，例如使用这个函数：

Instead of a "for" loop, use for example this function:

loadImages(imageURLarray);