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      <a class="index-header" href="/blog/2020/06/26/%E5%89%8D%E7%AB%AF%E5%BC%80%E5%8F%91%E8%A7%84%E8%8C%83/">前端开发规范</a>

      <a href="/blog/2020/06/26/%E5%89%8D%E7%AB%AF%E5%BC%80%E5%8F%91%E8%A7%84%E8%8C%83/" class="index-excerpt">


        <div>前端代码规范Front Standard Guide
前端 JS 项目开发规范规范的目的是为了编写高质量的代码，让你的团队成员每天的心情都是愉悦的，大家在一起是快乐的。

引自《阿里规约》的开头片段：
现代软件架构的复杂性需要协同开发完成，如何高效地协同呢？无规矩不成方圆，无规范难以协同，比如，制订交通法规表面上是要限制行车权，实际上是保障公众的人身安全，试想如果没有限速，没有红绿灯，谁还敢上路行</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/CSS%E5%AE%9E%E7%8E%B0%E5%A4%9A%E8%A1%8C%E6%96%87%E6%9C%AC%E6%BA%A2%E5%87%BA%E7%9C%81%E7%95%A5/">CSS实现多行文本溢出省略</a>

      <a href="/blog/2020/06/26/CSS%E5%AE%9E%E7%8E%B0%E5%A4%9A%E8%A1%8C%E6%96%87%E6%9C%AC%E6%BA%A2%E5%87%BA%E7%9C%81%E7%95%A5/" class="index-excerpt">


        <div>前言多行文本超出高度限制出现省略号 , 移动端多为webkit内核的 , 有扩展属性-webkit-line-clamp , 但并不是CSS规范中的属性 , PC端往往要借助js去实现这一效果，但麻烦且不是很靠谱，今天就用纯CSS来实现一个完全兼容的多行省略。
正文一、webkit内核的实现-webkit-line-clamp设置块元素包含的文本行数；display: -webkit-box设置块</div>
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            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/BFC%E3%80%81IFC%E3%80%81GFC%E5%92%8CFFC/">BFC、IFC、GFC和FFC</a>

      <a href="/blog/2020/06/26/BFC%E3%80%81IFC%E3%80%81GFC%E5%92%8CFFC/" class="index-excerpt">


        <div>BFC、IFC、GFC、FFCCSS2.1中只有BFC和IFC, CSS3中才有GFC和FFC。
到底什么是BFC、IFC、GFC和FFC
What’s FC？一定不是KFC，FC的全称是：Formatting Contexts，是W3C CSS2.1规范中的一个概念。它是页面中的一块渲染区域，并且有一套渲染规则，它决定了其子元素将如何定位，以及和其他元素的关系和相互作用。
BFCBFC(Bloc</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/retina%E5%B1%8F%E5%B9%951px%E8%BE%B9%E6%A1%86%E9%97%AE%E9%A2%98/">retina屏幕1px边框问题</a>

      <a href="/blog/2020/06/26/retina%E5%B1%8F%E5%B9%951px%E8%BE%B9%E6%A1%86%E9%97%AE%E9%A2%98/" class="index-excerpt">


        <div>7 种方法解决移动端 Retina 屏幕 1px 边框问题造成边框变粗的原因其实这个原因很简单，因为css中的1px并不等于移动设备的1px，这些由于不同的手机有不同的像素密度。在window对象中有一个devicePixelRatio属性，他可以反应css中的像素与设备的像素比。

devicePixelRatio的官方的定义为：设备物理像素和设备独立像素的比例，也就是 devicePixelR</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/%E8%A6%86%E7%9B%96%E5%85%83%E7%B4%A0%E5%AE%BD%E5%BA%A6/">覆盖元素宽度</a>

      <a href="/blog/2020/06/26/%E8%A6%86%E7%9B%96%E5%85%83%E7%B4%A0%E5%AE%BD%E5%BA%A6/" class="index-excerpt">


        <div>在不改变当前代码的情况下，使这张图片的宽度为300px?&lt;img src="1.jpg" style="width:480px!important"/&gt;


1.css方法&lt;img src="1.jpg" style="width:480px!important; max-width: 300px"&gt;
&lt;img src="1.jpg" style="width:48</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/opacity_visibility_display%E4%BC%98%E5%8A%A3/">opacity_visibility_display优劣</a>

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        <div>display: none;
DOM 结构：浏览器不会渲染 display 属性为 none 的元素，不占据空间；
事件监听：无法进行 DOM 事件监听；
性能：动态改变此属性时会引起重排，性能较差；
继承：不会被子元素继承，毕竟子类也不会被渲染；
transition：transition 不支持 display。

visibility: hidden;
DOM 结构：元素被隐藏，但是会被渲染</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/DIV%E6%B0%B4%E5%B9%B3%E5%9E%82%E7%9B%B4%E5%B1%85%E4%B8%AD/">DIV水平垂直居中</a>

      <a href="/blog/2020/06/26/DIV%E6%B0%B4%E5%B9%B3%E5%9E%82%E7%9B%B4%E5%B1%85%E4%B8%AD/" class="index-excerpt">


        <div>div水平垂直居中的方法在平时，我们经常会碰到让一个div框针对某个模块上下左右都居中（水平垂直居中），其实针对这种情况，我们有多种方法实现。
方法一:
　　绝对定位方法：不确定当前div的宽度和高度，采用 transform: translate(-50%,-50%); 当前div的父级添加相对定位（position: relative;）
　　图片展示：

　　代码如下：
div&#123</div>
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            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/BFC%E5%8F%8A%E5%85%B6%E5%BA%94%E7%94%A8/">BFC及其应用</a>

      <a href="/blog/2020/06/26/BFC%E5%8F%8A%E5%85%B6%E5%BA%94%E7%94%A8/" class="index-excerpt">


        <div>一、常见定位方案在讲 BFC 之前，我们先来了解一下常见的定位方案，定位方案是控制元素的布局，有三种常见方案:

普通流 (normal flow)


在普通流中，元素按照其在 HTML 中的先后位置至上而下布局，在这个过程中，行内元素水平排列，直到当行被占满然后换行，块级元素则会被渲染为完整的一个新行，除非另外指定，否则所有元素默认都是普通流定位，也可以说，普通流中元素的位置由该元素在 HTM</div>
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          <div class="post-meta mr-3">
            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/%E6%8E%A5%E5%8F%A3%E5%A6%82%E4%BD%95%E9%98%B2%E5%88%B7/">接口如何防刷</a>

      <a href="/blog/2020/06/26/%E6%8E%A5%E5%8F%A3%E5%A6%82%E4%BD%95%E9%98%B2%E5%88%B7/" class="index-excerpt">


        <div>接口如何防刷1：网关控制流量洪峰，对在一个时间段内出现流量异常，可以拒绝请求
2：源ip请求个数限制。对请求来源的ip请求个数做限制
3：http请求头信息校验；（例如host，User-Agent，Referer）
 4：对用户唯一身份uid进行限制和校验。例如基本的长度，组合方式，甚至有效性进行判断。或者uid具有一定的时效性
 5：前后端协议采用二进制方式进行交互或者协议采用签名机制
6</div>
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            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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      <a class="index-header" href="/blog/2020/06/26/HTTP%E5%92%8CHTTPS%E5%8D%8F%E8%AE%AE/">HTTP和HTTPS协议</a>

      <a href="/blog/2020/06/26/HTTP%E5%92%8CHTTPS%E5%8D%8F%E8%AE%AE/" class="index-excerpt">


        <div>HTTP与HTTPS


                                            一、前言：


先来观察这两张图，第一张访问域名http://www.12306.cn，谷歌浏览器提示不安全链接，</div>
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            <i class="iconfont icon-date"></i>&nbsp;2020-06-26
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