$(document).snowfall('clear');
$(document).snowfall({
    image: [
        "css/images/huaban_1.png",
        "css/images/huaban_2.png",
        "css/images/huaban_3.png",
        "css/images/huaban_4.png",
        "css/images/huaban_5.png",
        "css/images/huaban_6.png",
        "css/images/huaban_7.png"
    ],
    flakeCount: 20,
    minSize: 50,
    maxSize: 50
});