简单动画－让你的背景图动起来!!!

效果：
body{

        margin: 0px;
        height:100%;
        width:100%;
        background-image: url("bg.png");
        background-position-x: 0px;
        background-position-y: 0px;
        background-repeat: repeat;
    }

轮询改变body背景图动画，让世界地图作为背景正向平移。

    var body = $('body');
    var x =0;
    function polling() {
        x += 5;
        body.animate({
            'background-position-x': x+'%',
        }, 400, 'linear');
        setTimeout(polling,300)
    }

    polling();
    
效果二：
![图片描述][2]
鼠标移动后背景图根据坐标差计算移动距离。
var last = null;
var body = $('body');
$(document).mousemove(function(event){
    if(last == null){
        last = {
            x: event.pageX,
            y: event.pageY
        };
        return;
    }else{
        offset = {
            x: event.pageX - last.x,
            y: event.pageY - last.y
        };
        var top  = parseInt(body.css('background-position-y'))-offset.y;
        var max = screen.availHeight - 1024;
        if(max >= 0) max = 0;
        if(top > 0) top = 0;
        if(top < max) top = max;
        body.css({
            "background-position-x":(parseInt(body.css('background-position-x'))-offset.x)+'px',
            "background-position-y":top+'px'
        });
        last.x = event.pageX;
        last.y = event.pageY;
    }
});