记忆碎片-网络技术分享

之前在别的博客看到了挺漂亮的返回顶部效果，就直接拿来用了，也用了挺久的了，就是一个js调用。

后来在精简我的点点模板代码时候才发现，这个返回顶部代码居然是那么的臃肿，且还搞的看不懂他的源码如下

注：此处是别人的代码，不建议使用。。。

<div data-widget="backtop"><script src="http://diancom.sinaapp.com/backtop.js" charset="utf-8"></script></div>

div和js一起的，看起来很简单，把里面的js部分打开来看下，内容如下

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看到了吧，密密麻麻的，还是经过压缩的，我们给他解压和美化一下一共有4000多行啊 有木有

这怎么受得了呢。

我又不太懂js，所以在网上掏了整整一整天才找到了我想要的代码，效果和上面的一样，但是这个代码长度却只有一行。。。

js部分如下

<script type="text/javascript">
$(function(){$(".backtotop").click(function(){$("html,body").animate({scrollTop:0},200);return false});$(window).scroll(function(){var A=jQuery(".backtotop");if(A.offset().top>800){A.show()}else{A.hide()}});});
</script>

div部分

<a title="返回顶部" href="#header" class="backtotop"></a>

注：确实div部分只要有一个backtotop的class就可以了（话说 这个真花了我不少时间，js得真心要学下啊。。。。）其中里面的#header是为了不支持js的浏览器兼容性使用的，改成你的相应id内容即可。。。现在基本浏览器都支持js了吧。。。

css部分
.backtotop {position: fixed;visibility: visible;width:40px;height:40px;right: 20px;bottom: 20px;display: none;background: transparent url('http://img170.poco.cn/mypoco/myphoto/20120429/14/61279828201204291423333116442926539_000.jpg') no-repeat top left;}
很简单吧，如果想改成别的图片 自定修改css部分的图片地址以及修改相应的高度和宽度即可。

之前使用本站分享的公告栏教程的 ，想添加返回顶部的话 请转至在你的点点（通用）博客中加入底部公告栏

演示效果：记忆碎片底部公告栏部分

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