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<article id="post-Hybrid-App技术解析-原理篇" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/09/12/Hybrid-App技术解析-原理篇/">Hybrid App技术解析 -- 原理篇</a>
</h1>
<a href="/2018/09/12/Hybrid-App技术解析-原理篇/" class="archive-article-date">
<time datetime="2018-09-12T09:23:24.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-09-12</time>
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<h2 id="现有混合方案"><a href="#现有混合方案" class="headerlink" title="#现有混合方案"></a>#现有混合方案</h2><p>Hybrid App，俗称混合应用，即混合了 Native技术 与 Web技术 进行开发的移动应用。现在比较流行的混合方案主要有三种，主要是在UI渲染机制上的不同：</p>
<ol>
<li>基于 WebView UI 的基础方案，市面上大部分主流 App 都有采用，例如微信JS-SDK，通过 JSBridge 完成 H5 与 Native 的双向通讯，从而赋予H5一定程度的原生能力。</li>
<li>基于 Native UI 的方案，例如 React-Native、Weex。在赋予 H5 原生API能力的基础上，进一步通过 JSBridge 将js解析成的虚拟节点树(Virtual DOM)传递到 Native 并使用原生渲染。</li>
<li>另外还有近期比较流行的小程序方案，也是通过更加定制化的 JSBridge，并使用双 WebView 双线程的模式隔离了JS逻辑与UI渲染，形成了特殊的开发模式，加强了 H5 与 Native 混合程度，提高了页面性能及开发体验。</li>
</ol>
<p>以上的三种方案，其实同样都是基于 JSBridge 完成的通讯层，第二三种方案，其实可以看做是在方案一的基础上，继续通过不同的新技术进一步提高了应用的混合程度。因此，JSBridge 也是整个混合应用最关键的部分，例如我们在设置微信分享时用到的 JS-SDK，wx对象 便是我们最常见的 JSBridge:</p>
<p><img src="https://segmentfault.com/img/bVbeQ3l?w=500&h=455" alt="https://segmentfault.com/img/bVbeQ3l?w=500&h=455"></p>
<h2 id="方案选型"><a href="#方案选型" class="headerlink" title="#方案选型"></a>#方案选型</h2><p>任何技术方案的选型，其实都应该基于使用场景和现有条件。基于公司现有情况的几点考虑，在方案一上进一步优化，更加适合我们的需求。</p>
<ul>
<li>需求 Web技术 快速迭代、灵活开发的特点和线上热更新的机制。</li>
<li>产品的核心能力是强大的拍照与底层图片处理能力，因此单纯的 H5技术能做的事非常有限，不能满足需求，通过 Hybrid 技术来强化H5，便是一种必需。</li>
<li>公司业务上，并没有非常复杂的UI渲染需求，而且 App 中的一系列原生 UI组件 已经非常成熟，因此我们并不强需类似 RN 这样的方案。</li>
</ul>
<p>因此，如何既能利用 H5 强大的开发和迭代能力，又能赋予 H5 强大的底层能力和用户体验，同时能复用现有的成熟 Native组件，便成为了我们最大的需求点 – 一套完整又强大的 Hybrid技术架构方案。</p>
<h2 id="Hybrid技术原理"><a href="#Hybrid技术原理" class="headerlink" title="#Hybrid技术原理"></a>#Hybrid技术原理</h2><p>Hybrid App的本质，其实是在原生的 App 中，使用 WebView 作为容器直接承载 Web页面。因此，最核心的点就是 Native端 与 H5端 之间的双向通讯层，其实这里也可以理解为我们需要一套跨语言通讯方案，来完成 Native(Java/Objective-c/…) 与 JavaScript 的通讯。这个方案就是我们所说的 JSBridge，而实现的关键，便是作为容器的 WebView，一切的原理都是基于 WebView 的机制。</p>
<p><img src="https://mmbiz.qpic.cn/mmbiz_jpg/aVp1YC8UV0fOXBnc9R5yWwuuicR0PfMMwJguS1GMXUFrtpiaVlyuaBlP8HRIMI3bjPt72O2fvOoAx6QwF902PBDQ/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1" alt="https://mmbiz.qpic.cn/mmbiz_jpg/aVp1YC8UV0fOXBnc9R5yWwuuicR0PfMMwJguS1GMXUFrtpiaVlyuaBlP8HRIMI3bjPt72O2fvOoAx6QwF902PBDQ/640?wx_fmt=jpeg&wxfrom=5&wx_lazy=1&wx_co=1"></p>
<h2 id="一-JavaScript-通知-Native"><a href="#一-JavaScript-通知-Native" class="headerlink" title="(一) JavaScript 通知 Native"></a>(一) JavaScript 通知 Native</h2><p>基于 WebView 的机制和开放的 API, 实现这个功能有三种常见的方案：</p>
<ul>
<li><p>API注入，原理其实就是 Native 获取 JavaScript环境上下文，并直接在上面挂载对象或者方法，使 js 可以直接调用，Android 与 IOS 分别拥有对应的挂载方式</p>
</li>
<li><p>WebView 中的 prompt/console/alert 拦截，通常使用 prompt，因为这个方法在前端中使用频率低，比较不会出现冲突</p>
</li>
<li><p>WebView URL Scheme 跳转拦截</p>
</li>
</ul>
<p>第二三种机制的原理是类似的，都是通过对 WebView 信息冒泡传递的拦截，从而达到通讯的，接下来我们主要从 原理-定制协议-拦截协议-参数传递-回调机制 5个方面详细阐述下第三种方案 – URL拦截方案。</p>
<ol>
<li>实现原理</li>
</ol>
<p>在 WebView 中发出的网络请求，客户端都能进行监听和捕获</p>
<ol start="2">
<li>协议的定制</li>
</ol>
<p>我们需要制定一套URL Scheme规则，通常我们的请求会带有对应的协议开头，例如常见的 <a href="https://xxx.com" target="_blank" rel="noopener">https://xxx.com</a> 或者 file://1.jpg，代表着不同的含义。我们这里可以将协议类型的请求定制为:</p>
<p>xxcommand://xxxx?param1=1&param2=2</p>
<p>这里有几个需要注意点的是:</p>
<p>(1) xxcommand:// 只是一种规则，可以根据业务进行制定，使其具有含义，例如我们定义 xxcommand:// 为公司所有App系通用，为通用工具协议：</p>
<p>xxcommand://getProxy?h=1<br>而定义 xxapp:// 为每个App单独的业务协议。</p>
<p>xxapp://openCamera?h=2</p>
<p>不同的协议头代表着不同的含义，这样便能清楚知道每个协议的适用范围。</p>
<p>(2) 这里不要使用 location.href 发送，因为其自身机制有个问题是同时并发多次请求会被合并成为一次，导致协议被忽略，而并发协议其实是非常常见的功能。我们会使用创建 iframe 发送请求的方式。</p>
<p>(3) 通常考虑到安全性，需要在客户端中设置域名白名单或者限制，避免公司内部业务协议被第三方直接调用。</p>
</div>
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<a class="article-more-a" href="/2018/09/12/Hybrid-App技术解析-原理篇/">展开全文 >></a>
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<article id="post-前端要凉？微软开源Sketch2Code，草图秒变代码" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/09/12/前端要凉？微软开源Sketch2Code，草图秒变代码/">前端要凉？微软开源Sketch2Code，草图秒变代码</a>
</h1>
<a href="/2018/09/12/前端要凉？微软开源Sketch2Code，草图秒变代码/" class="archive-article-date">
<time datetime="2018-09-12T08:16:10.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-09-12</time>
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<p><a href="https://mp.weixin.qq.com/s?__biz=MzUxMzcxMzE5Ng==&mid=2247489475&idx=1&sn=69558d1c9518bf7429e42970e175810b&chksm=f951a280ce262b9618411cac4ec0de4bfaef94aa8389a55e6b2220140453debc5ad2f2982c6b&mpshare=1&scene=23&srcid=0912KeIVLoAu8s98RTEFpMMf%23rd" target="_blank" rel="noopener">原文参考链接</a></p>
<p>本以为是个神奇，最起码提高一部分Page部分的开发效率，结果有点儿失望了，自己画了张草图测试结果如下：</p>
<p><img src="/assets/bug.png" alt="测试结果" title="'测试结果'"></p>
<p>果断弃坑！</p>
</div>
<div class="article-info article-info-index">
<p class="article-more-link">
<a class="article-more-a" href="/2018/09/12/前端要凉？微软开源Sketch2Code，草图秒变代码/">展开全文 >></a>
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<article id="post-图说javascript" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/09/10/图说javascript/">图说javascript</a>
</h1>
<a href="/2018/09/10/图说javascript/" class="archive-article-date">
<time datetime="2018-09-10T03:18:16.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-09-10</time>
</a>
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<p><img src="https://o3vamlxcv.qnssl.com/wp-content/uploads/2018/09/v2-c6abab0936a5e136e306123d6d7036d3_r.jpg" alt="avatar"></p>
<p>逛知乎的时候发现@DDDD转了一张图，这张图对js魔法的吐槽可谓非常到位。下面，我们就从这张图出发来详细讲讲js。</p>
<h2 id="数字类型与精度问题"><a href="#数字类型与精度问题" class="headerlink" title="数字类型与精度问题"></a>数字类型与精度问题</h2><p>虽然js是弱类型语言，声明变量时也不需要显式指定类型。但是，数据本身依旧还是有类型的，比如数字和字符串就是以不同形式存在的数据。在js中，所有数字的类型都为number。其中，一个特殊的数字就是NaN（Not a number），虽然名字叫“不是数”，但为了计算的一致性（IEEE745亦规定），NaN依旧是数字类型的。任何NaN参与的数字计算的结果都还是NaN。（NaN-NaN!=0）还需要注意的是，js中被0除非但不会报错，而且结果也不是NaN（只有0/0是NaN），而是Infinity（被除数为正）或-Infinity（被除数为负）。</p>
<p>由于将整数和浮点数统一处理，所以js并不存在整数和浮点数的区别——所有数字都以64位有符号浮点数（IEEE745格式）的形式存储。因此，舍入误差是js数字类型的一个大坑。最经典的当然就是0.1+0.2!=0.3了。其实这不是js的锅，大部分编程语言都有这个问题。简单的解释可以查看<a href="http://0.30000000000000004.com" target="_blank" rel="noopener">http://0.30000000000000004.com</a>。很多人对浮点数都有误解，认为0.1是1×10的-1次方，所以可以正确的表示0.1，然而浮点数并不是这样。在2为基数的情况下，0.1=1/10是一个无限循环小数，所以在运算时会产生舍入误差。想要进一步了解可以查阅有关数值计算的材料。</p>
<h2 id="Max、Min与函数参数"><a href="#Max、Min与函数参数" class="headerlink" title="Max、Min与函数参数"></a>Max、Min与函数参数</h2><p>在js中，函数参数也是一种魔法。一般编程语言中，形参具有类似“约束”的作用，即实参的数量要与形参相符（默认值除外）。但是js魔法并不需要形参和实参相匹配，多的实参忽略，少的就是undefined。事实上，js还提供了一种访问参数的方法。在函数体上下文中，js提供了arguments（类似Python的*args）以便参数的访问。考虑到没有卵用的形参，js函数的形参更像是一个别名。</p>
<p>在Python中，函数重载可以通过默认值实现，而在js中，你可以随心所欲的解析arguments，可以说是很硬核了。</p>
<p>回到我们的max和min。EMCAScript v3之后，max和min就支持任意数量参数的调用了。从逻辑上考虑，既然没有传入任何数，那取最大的函数就不能返回一个能大于任何数的数，所以返回-Infinity不无道理。min亦然。</p>
<h2 id="魔法操作符-、"><a href="#魔法操作符-、" class="headerlink" title="魔法操作符+、-"></a>魔法操作符+、-</h2><p>为了更好的理解接下来的坑，我们有必要先看看+、-两个操作符。这俩操作符神奇就神奇在，他们不仅仅是双目运算符，也同时是单目运算符！对于+，双目运算时其意义是数字加或字符串拼接。这里有个很坑的地方，就是只要参与运算的值不全是数字，那么+就会被视为字符串拼接（String.concat），从而把所有参数转换为字符串并进行拼接。单目运算时，+被视为取正，所有传入的参数都会被转换为数字并取正。（然而取正并没有任何卵用，所以其实就是转为数字）</p>
<p>相比之下-就和蔼了许多，双目是数值减，单目这是取反。</p>
<h2 id="无奈的解释器"><a href="#无奈的解释器" class="headerlink" title="无奈的解释器"></a>无奈的解释器</h2><p>下面这个魔法涉及到的东西很多，不过我还是打算把它归类到解释器的范畴，而且这个锅要丢给REPL。{}+[]具歧义，可以被理解为：</p>
<p>（作为值理解）对象{}+数组，+为双目<br>（作为代码块理解）{}为代码块，+是单目<br>而这两种理解下的结果也是不同的。而在REPL的上下文下，js解释器采用了第二种理解。而一旦上下文变化，提示解释器这是表达式时，解释器就会采用第一种理解。比如console.log({}+[])的结果就不再是0了。</p>
<h2 id="隐式类型转换"><a href="#隐式类型转换" class="headerlink" title="隐式类型转换"></a>隐式类型转换</h2><p>之前在说+、-的时候，我提到了一些隐式的转换，其实这样的转换远不止出现在+、-。比如取反!，就会转成布尔型再取反。所以!+[]就是true，![]是false。考虑到运算优先级，最后得到”truefalse”。</p>
<p>作为一个弱类型语言，js的逻辑是，如果类型不对，那就转过去。</p>
<h2 id="与"><a href="#与" class="headerlink" title="==与==="></a>==与===</h2><p>这是个老生常谈的东西了。这里不多讲，只要知道==可能会隐式转换类型就行。</p>
<h2 id="后记"><a href="#后记" class="headerlink" title="后记"></a>后记</h2><p>我写这篇文章的目的并不是解释这张图，因为这张图里的很多知识并不是实际编程所需要的（就像i+++++i，这些是我认为不重要的知识）。我是希望借这张图聊到一些js的语法特性，以加深对js的理解。这两点在我看来有本质的区别。</p>
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<input class="search-ipt" q-model="search" type="text" placeholder="find something…">
<i class="icon-search icon" q-show="search|isEmptyStr"></i>
<i class="icon-close icon" q-show="search|isNotEmptyStr" q-on="click:clearChose(e)"></i>
</div>
<div class="widget tagcloud search-tag">
<p class="search-tag-wording">tag:</p>
<label class="search-switch">
<input type="checkbox" q-on="click:toggleTag(e)" q-attr="checked:showTags">
</label>
<ul class="article-tag-list" q-show="showTags">
<li class="article-tag-list-item">
<a href="javascript:void(0)" class="js-tag color1">hello！ my blog！</a>
</li>
<div class="clearfix"></div>
</ul>
</div>
<ul class="search-ul">
<p q-show="jsonFail" style="padding: 20px; font-size: 12px;">
缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
3、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
</pre>
</p>
<li class="search-li" q-repeat="items" q-show="isShow">
<a q-attr="href:path|urlformat" class="search-title"><i class="icon-quo-left icon"></i><span q-text="title"></span></a>
<p class="search-time">
<i class="icon-calendar icon"></i>
<span q-text="date|dateformat"></span>
</p>
<p class="search-tag">
<i class="icon-price-tags icon"></i>
<span q-repeat="tags" q-on="click:choseTag(e, name)" q-text="name|tagformat"></span>
</p>
</li>
</ul>
</section>
<section class="tools-section tools-section-friends" q-show="friends">
<ul class="search-ul">
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接1</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接2</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接3</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接4</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接5</a>
</li>
<li class="search-li">
<a href="http://localhost:4000/" target="_blank" class="search-title"><i class="icon-quo-left icon"></i>友情链接6</a>
</li>
</ul>
</section>
<section class="tools-section tools-section-me" q-show="aboutme">
<div class="aboutme-wrap" id="js-aboutme">很惭愧<br><br>只做了一点微小的工作<br>谢谢大家</div>
</section>
</div>
</div>
<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
<!-- Background of PhotoSwipe.
It's a separate element as animating opacity is faster than rgba(). -->
<div class="pswp__bg"></div>
<!-- Slides wrapper with overflow:hidden. -->
<div class="pswp__scroll-wrap">
<!-- Container that holds slides.
PhotoSwipe keeps only 3 of them in the DOM to save memory.
Don't modify these 3 pswp__item elements, data is added later on. -->
<div class="pswp__container">
<div class="pswp__item"></div>
<div class="pswp__item"></div>
<div class="pswp__item"></div>
</div>
<!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
<div class="pswp__ui pswp__ui--hidden">
<div class="pswp__top-bar">
<!-- Controls are self-explanatory. Order can be changed. -->
<div class="pswp__counter"></div>
<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
<button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>
<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
<!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
<!-- element will get class pswp__preloader--active when preloader is running -->
<div class="pswp__preloader">
<div class="pswp__preloader__icn">
<div class="pswp__preloader__cut">
<div class="pswp__preloader__donut"></div>
</div>
</div>
</div>
</div>
<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
<div class="pswp__share-tooltip"></div>
</div>
<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
</button>
<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
</button>
<div class="pswp__caption">
<div class="pswp__caption__center"></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>