我要评论按钮样式：
需要加载jq
<script>
(function(a){a.fn.scrolltotop=function(c){var d={speed:800};c&&a.extend(d,{speed:c});return this.each(function(){var b=a(this);a(window).scroll(function(){100<a(this).scrolltop()?b.fadein():b.fadeout()});b.click(function(b){b.preventdefault();a("body, html").animate({scrolltop:0},d.speed)})})}})(jquery);$(function(){ahtml='<a href="javascript:void(0)" id="totop" style="display:none;position:fixed;bottom:66px;right:10px;width:45px;height:45px;border-radius:50%;overflow:hidden;background-image:url(\'data:image/png;base64,ivborw0kggoaaaansuheugaaabcaaaawbamaaadzwbo2aaaalvbmveuaaab5exl5exl5exl5exl5exl5exl5exl5exl5exl5exl5exl5exl5exl5exl4rtniaaaadnrstlmarhe7zu7dmxgiiqqzzhsj3dwaaab/surbvbjtywadpgyk8oabgs2hlpuajba6+jak4fj8ujlqylkxsqntxhids/gwbozcpcefeop6cnykvhmygoqygjiymbl4bbgfgdjsrxi4nvmjscsaocchh3yhjjqazv4wcdzno6tfanytwsaswcfaaofmfrcdaod0v3vdaoiaannhhkk0/kxuaaaaaelftksuqmcc\');background-repeat:no-repeat;background-position:center;z-index:999;cursor:pointer;border:1px solid #d8d8d8;box-sizing:border-box;opacity:0.9;"></a>';$("body").append(ahtml);$("#totop").scrolltotop(300);});
</script>
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