Phonegap:图片库加载非常缓慢

Javascript是单线程的,因此回调将在阻塞UI的同一个主线程中启动。尝试将您的代码更改为:

listGalleryContents(synchedsdcardfolder, loadUnSyncedFolder);

function loadUnSynchedFolder() {
   setTimeout(function() {
       listGalleryContents(unsynchedsdcardfolder, allFoldersLoaded);
   }, 0);
}

function allFoldersLoaded() {
   setTimeout(showGalleryPage, 0);
}

function listGalleryContents(directoryEntry, onComplete) {
var successCallback = onComplete;
var directoryReader = directoryEntry.createReader();
directoryReader.readEntries(
     function(entries) { readSuccess(entries, successCallback); } , 
     function(error){ 
        alert("Error: = " + error.code);
     });
}

function readSuccess(entries, onComplete) { // success get files and folders
    var i = 0, length = entries.length; 
    for(; i < length ; ++i) { // why are you using ++i and not i++ ??
        if(entries[i].name.indexOf(".") > 0 && entries[i].isFile) {
            imagesArray.push(entries[i].fullPath);
        }
    }
    onComplete();
   }
}

我还没有测试过这个代码。如果您看到错误,您可能需要对其进行小的修改。