1 function preloadImages(array) { 2     if (!preloadImages.list) { 3         preloadImages.list = []; 4     } 5     for (var i = 0; i < array.length; i++) { 6         var img = new Image(); 7         img.onload = function() { 8             var index = preloadImages.list.indexOf(this); 9             if (index !== -1) {10                 // remove this one from the array once it‘s loaded11                 // for memory consumption reasons12                 preloadImages.splice(index, 1);13             }14         }15         preloadImages.list.push(img);16         img.src =http://www.mamicode.com/ array[i];17     }18 }19 20 preloadImages(["url1.jpg", "url2.jpg", "url3.jpg"]);