css代码中使用!important有什么用呢(Pg.1)

<html style="font-size: 42.666666666666664px; "><head><script async="" src="https://wuliao.epro.sogou.com/ask?id=967898&ssi0=0&cb=SOGOU_STAR_SETJSONADSLOT_ca22f214df555a46&af=1&sohuurl=https%3A%2F%2Fblog.csdn.net%2Fbymyself11%2Farticle%2Fdetails%2F52055115&wsg=w-0_dx-99"></script><script type="text/javascript" charset="utf-8" src="http://zhannei.baidu.com/api/customsearch/apiaccept?sid=10742016945123576423&v=2.0&callback=csdn.afterBaiduSearchInit"></script>
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<meta content="yes" name="apple-mobile-web-app-capable">
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<title>css中使用!important优先级最高问题 - CSDN博客</title>
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<script>
//h5定义rem
initpage();
window.onresize = initpage;
function initpage(){
var view_width = document.getElementsByTagName('html')[0].getBoundingClientRect().width;
var _html = document.getElementsByTagName('html')[0];
window.fontSize = view_width>750?750/7.5:view_width/7.5;
_html.style.fontSize= window.fontSize+'px';
}
</script>
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var username = "bymyself11";
var currentUserName = "";
var blog_address = "https://blog.csdn.net/bymyself11";
var fileName = "52055115";
var baiduKey = "%21important%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E4%BC%98%E5%85%88%E7%BA%A7%E5%B0%8F%E4%BA%8Estyle";
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<script src="//msite.baidu.com/sdk/c.js?appid=1563894916825412"></script><script type="text/javascript" charset="utf-8" src="//csdnimg.cn/public/common/toolbar/js/m_iconfont.js"></script><script type="text/javascript" charset="utf-8" async="" src="https://ae.bdstatic.com/msite/static/sdk/ability.27b9aa95.js"></script><link rel="stylesheet" type="text/css" href="//csdnimg.cn/public/common/gotop/css/goTop.min.css?v20180326104254"><style type="text/css">#cambrian0,#cambrian1,#cambrian2,#cambrian3,#cambrian4{color:#000;font-style:normal;font-weight:400;letter-spacing:normal;word-spacing:normal;white-space:normal}#cambrian0,#cambrian0 div,#cambrian0 img,#cambrian1,#cambrian1 div,#cambrian1 img,#cambrian2,#cambrian2 div,#cambrian2 img,#cambrian3,#cambrian3 div,#cambrian3 img,#cambrian4,#cambrian4 div,#cambrian4 img{width:auto;height:auto;margin:0;padding:0;background-color:transparent;background-position:0 0;background-size:auto;background-repeat:repeat;background-origin:padding-box;background-clip:border-box;background-attachment:scroll;background-image:none;border:none;outline:medium none invert;color:inherit;direction:ltr;letter-spacing:inherit;line-height:normal;text-align:left;text-decoration:none;text-indent:0;text-transform:none;white-space:inherit;word-spacing:normal;font-size:12px;font-family:HanHei SC,PingHei,PingFang SC,STHeitiSC-Light,Helvetica Neue,Helvetica,Arial,sans-serif;font-size-adjust:none;font-stretch:normal;font-style:inherit;font-variant:normal;font-weight:inherit;visibility:visible;overflow:visible;list-style:none;float:none;clear:none;display:block;position:static;top:auto;left:auto;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box}#cambrian0 a,#cambrian0 b,#cambrian0 em,#cambrian0 img,#cambrian0 span,#cambrian0 strong,#cambrian1 a,#cambrian1 b,#cambrian1 em,#cambrian1 img,#cambrian1 span,#cambrian1 strong,#cambrian2 a,#cambrian2 b,#cambrian2 em,#cambrian2 img,#cambrian2 span,#cambrian2 strong,#cambrian3 a,#cambrian3 b,#cambrian3 em,#cambrian3 img,#cambrian3 span,#cambrian3 strong,#cambrian4 a,#cambrian4 b,#cambrian4 em,#cambrian4 img,#cambrian4 span,#cambrian4 strong{display:inline}</style><style type="text/css">#cambrian0 ._25ZfXD,#cambrian1 ._25ZfXD,#cambrian2 ._25ZfXD,#cambrian3 ._25ZfXD,#cambrian4 ._25ZfXD{width:57px;padding:8px 0;text-align:center;font-weight:300;font-size:12px;line-height:12px;vertical-align:middle;display:inline-block;color:#fff;background:#3897f0;border-radius:3px;-webkit-tap-highlight-color:transparent}#cambrian0 ._25ZfXD:active,#cambrian1 ._25ZfXD:active,#cambrian2 ._25ZfXD:active,#cambrian3 ._25ZfXD:active,#cambrian4 ._25ZfXD:active{background-color:rgba(56,151,240,.2)}#cambrian0 .t2tRkr,#cambrian1 .t2tRkr,#cambrian2 .t2tRkr,#cambrian3 .t2tRkr,#cambrian4 .t2tRkr{color:#666;background-color:#fff;position:relative;z-index:0;border-radius:2px}#cambrian0 .t2tRkr:after,#cambrian1 .t2tRkr:after,#cambrian2 .t2tRkr:after,#cambrian3 .t2tRkr:after,#cambrian4 .t2tRkr:after{content:"";position:absolute;box-sizing:border-box;top:0;left:0;border:1px solid #ccc;border-radius:4px;width:200%;height:200%;z-index:-1;transform:scale(.

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