本效果需要浏览器支持CSS3，如果您的浏览器属于远古浏览器（IE6等），那么是无法看到这个效果的。

#circle {
    background-color: rgba(0,0,0,0);
    border:5px solid rgba(10,10,10,0.9);
    opacity:.9;
    border-right:5px solid rgba(0,0,0,0);
    border-left:5px solid rgba(0,0,0,0);
    border-radius:50px;
    box-shadow: 0 0 35px #808080;
    width:50px;
    height:50px;
        margin:0 auto;
    position:fixed;
        left:30px;
        bottom:30px;
    -moz-animation:spinPulse 1s infinite ease-in-out;
    -webkit-animation:spinPulse 1s infinite ease-in-out;
    -o-animation:spinPulse 1s infinite ease-in-out;
    -ms-animation:spinPulse 1s infinite ease-in-out;

}
#circle1 {
    background-color: rgba(0,0,0,0);
    border:5px solid rgba(20,20,20,0.9);
    opacity:.9;
    border-left:5px solid rgba(0,0,0,0);
    border-right:5px solid rgba(0,0,0,0);
    border-radius:50px;
    box-shadow: 0 0 15px #202020;
    width:30px;
    height:30px;
        margin:0 auto;
        position:fixed;
        left:40px;
        bottom:40px;
    -moz-animation:spinoffPulse 1s infinite linear;
    -webkit-animation:spinoffPulse 1s infinite linear;
    -o-animation:spinoffPulse 1s infinite linear;
    -ms-animation:spinoffPulse 1s infinite linear;
}
@-moz-keyframes spinPulse {
    0% { -moz-transform:rotate(160deg); opacity:0; box-shadow:0 0 1px #505050;}
    50% { -moz-transform:rotate(145deg); opacity:1; }
    100% { -moz-transform:rotate(-320deg); opacity:0; }
}
@-moz-keyframes spinoffPulse {
    0% { -moz-transform:rotate(0deg); }
    100% { -moz-transform:rotate(360deg);  }
}
@-webkit-keyframes spinPulse {
    0% { -webkit-transform:rotate(160deg); opacity:0; box-shadow:0 0 1px #505050; }
    50% { -webkit-transform:rotate(145deg); opacity:1;}
    100% { -webkit-transform:rotate(-320deg); opacity:0; }
}
@-webkit-keyframes spinoffPulse {
    0% { -webkit-transform:rotate(0deg); }
    100% { -webkit-transform:rotate(360deg); }
}
@-o-keyframes spinPulse {
    0% { -o-transform:rotate(160deg); opacity:0; box-shadow:0 0 1px #505050; }
    50% { -o-transform:rotate(145deg); opacity:1;}
    100% { -o-transform:rotate(-320deg); opacity:0; }
}
@-o-keyframes spinoffPulse {
    0% { -o-transform:rotate(0deg); }
    100% { -o-transform:rotate(360deg); }
}
@-ms-keyframes spinPulse {
    0% { -ms-transform:rotate(160deg); opacity:0; box-shadow:0 0 1px #505050; }
    50% { -ms-transform:rotate(145deg); opacity:1;}
    100% { -ms-transform:rotate(-320deg); opacity:0; }
}
@-ms-keyframes spinoffPulse {
    0% { -ms-transform:rotate(0deg); }
    100% { -ms-transform:rotate(360deg); }
}

在需要加载的位置添加

<div id="circle"></div>
<div id="circle1"></div>

最后加入淡入淡出的Javascript代码

$(window).load(function() {
    $("#circle").fadeOut(500);
    $("#circle1").fadeOut(700);
});

内容来自：小董博客