一款实用的图片预加载技术，真正实现加载完成显示图片，加载过程中显示进度指示，本加载可以批量进行，将成批图片加载完成才显示，使用循环依次载入图片，并将路径暂存在数组中，加载完成后取出数组数据并显示-A practical picture pre-loaded technology, realize finished loading display pictures, a progress indicator appears in the loading process, the load can batch will bulk image is loaded before displaying sequentially load images using a loop, and the path is temporarily stored in the array, the load is complete, remove the array data and display