图片预加载 解决图片加载闪动问题

方法一：

 1 <script type="text/javascript">
 2     var img01 = new Image();
 3     var img02 = new Image();
 4     var img03 = new Image();
 5     var img04 = new Image();
 6     img01.src = "img/1.jpg";
 7     img02.src = "img/2.jpg";
 8     img03.src = "img/3.jpg";
 9     img04.src = "img/4.jpg";
10 </script>

缺点：如果加载图片较多，比较麻烦

方法二：

var images = new Array();

    function preLoad() {
        for (var i = 0; i < preLoad.arguments.length; i++) {
            imgs[i] = new Image();
            imgs[i].src = preLoad.arguments[i];
        }
    }

preLoad("img/1.jpg", "img/2.jpg", "img/3.jpg")