jquery预加载图片的方法

function preloadImages(oImageList, callback) {
 if ( typeof (oImageList) == 'object' && typeof (callback) === "function") {
  var iCallbackAfter = oImageList.length;
  var iPreloadInterval = window.setInterval(function() {
   if (iCallbackAfter === 0) {
    window.clearInterval(iPreloadInterval);
    callback();
   }
  }, 100);
  $.each(oImageList, function(iIndex, sImage) {
   oImageList[iIndex] = new Image();
   oImageList[iIndex].onload = function(oResult) {
    iCallbackAfter--;
   };
   oImageList[iIndex].onabort = function(oResult) {
    console.log(oResult);
   };
   oImageList[iIndex].onerror = function(oResult) {
    console.log(oResult);
   };
   if (!sImage.match('http://')) {
    sImage = sImage;
   }
   oImageList[iIndex].src = sImage;
  });
 }
}