方法:
function imagesLoaded(imgAr, callback){
var
// This is a copy of the array of images
imageAr = imgAr.slice(0),
// This holds the javascript Image Objects
images = [],
// This is the number of Images that has loaded
loadedCount = 0;
var imageLoaded = function(){
// An image has finished loading, so increment the number of images loaded by 1
loadedCount++;
if(loadedCount>=imageAr.length){
// If all images have finished loading, run the 'callback' function, to report back that images have all loaded
callback.call();
}
}
// Loop around each image url
for(var i=0;i<imageAr.length;i++){
// For each image, create a new object
images[i] = new Image();
// when the image finishes loading, call the imageLoaded function
images[i].onload = imageLoaded;
// Assign the image the appropriate src attribute
images[i].src = imageAr[i];
}
}
用途:
var imageAr = ['a.jpg', 'b.jpg', 'c.jpg'];
imagesLoaded(imageAr, function(){
alert('Images loaded!');
});
HI jeztems,對不起我的無知。這是什麼目的? 「callback.apply({},[]);」 。這是實際的代碼嗎?放在這一行? – Elder
是的,它不代表在代碼中,我編輯了原始文章以更好地解釋發生了什麼。在這種情況下,「callback.apply({},[])」的含義與「callback()」完全相同,您可以在這裏閱讀更多關於應用的信息:https://developer.mozilla.org/en/JavaScript/Reference/ Global_Objects /功能/應用 –