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如何用js实现JSON.parse().html
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<!DOCTYPE html>
<!--
_ooOoo_
o8888888o
88" . "88
(| -_- |)
O\ = /O
____/`---'\____
.' \\| |// `.
/ \\||| : |||// \
/ _||||| -:- |||||- \
| | \\\ - /// | |
| \_| ''\---/'' | |
\ .-\__ `-` ___/-. /
___`. .' /--.--\ `. . __
."" '< `.___\_<|>_/___.' >'"".
| | : `- \`.;`\ _ /`;.`/ - ` : | |
\ \ `-. \_ __\ /__ _/ .-` / /
======`-.____`-.___\_____/___.-`____.-'======
`=---='
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
佛祖保佑 永无BUG
-->
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<h2 class="post-title" itemprop="name headline">如何用js实现JSON.parse()</h2>
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2018-12-22
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<span id="/%E5%A6%82%E4%BD%95%E7%94%A8js%E5%AE%9E%E7%8E%B0JSON.parse().html" class="leancloud_visitors" data-flag-title="如何用js实现JSON.parse()">
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<span class="post-meta-item-text">热度 </span>
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<span class="post-meta-item-text">字数统计：</span>
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328 (字)
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2 (分钟)
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<h2 id="eval"><a href="#eval" class="headerlink" title="eval"></a>eval</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> json = <span class="string">'{"a":"1", "b":2}'</span>;</span><br><span class="line"><span class="keyword">var</span> obj = <span class="built_in">eval</span>(<span class="string">"("</span> + json + <span class="string">")"</span>); <span class="comment">// obj 就是 json 反序列化之后得到的对象</span></span><br></pre></td></tr></table></figure>
<blockquote>
<p>为什么要加括号呢？
因为js中{}通常是表示一个语句块，eval只会计算语句块内的值进行返回。加上括号就变成一个整体的表达式。</p>
</blockquote>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">console</span>.log( <span class="built_in">eval</span>(<span class="string">'{}'</span>) ); <span class="comment">// undefind</span></span><br><span class="line"><span class="built_in">console</span>.log( <span class="built_in">eval</span>(<span class="string">'({})'</span>) ); <span class="comment">// Object {}</span></span><br></pre></td></tr></table></figure>
<blockquote>
<p>eval作用域问题
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> s = <span class="number">1</span>;</span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">a</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="built_in">eval</span>(<span class="string">'var s=2'</span>);</span><br><span class="line"> <span class="built_in">console</span>.log(s);</span><br><span class="line">}</span><br><span class="line">a(); <span class="comment">// 2</span></span><br><span class="line"><span class="built_in">console</span>.log(s); <span class="comment">// 1</span></span><br></pre></td></tr></table></figure>
在局部环境使用eval便会创建局部变量。可以显示指定eval调用者来改变上下文环境。</p>
</blockquote>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> s = <span class="string">'global'</span>;</span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">a</span>(<span class="params"></span>) </span>{</span><br><span class="line"> <span class="built_in">eval</span>(<span class="string">'var s = "local"'</span>);</span><br><span class="line"> <span class="built_in">console</span>.log(s); <span class="comment">// local</span></span><br><span class="line"> <span class="built_in">console</span>.log(<span class="built_in">eval</span>(<span class="string">'s'</span>)); <span class="comment">// local</span></span><br><span class="line"> <span class="built_in">console</span>.log(<span class="built_in">window</span>.eval(<span class="string">'s'</span>)); <span class="comment">// global</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="对参数json进行校验防止xss漏洞"><a href="#对参数json进行校验防止xss漏洞" class="headerlink" title="对参数json进行校验防止xss漏洞"></a>对参数json进行校验防止xss漏洞</h3><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> rx_one = <span class="regexp">/^[\],:{}\s]*$/</span>;</span><br><span class="line"><span class="keyword">var</span> rx_two = <span class="regexp">/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g</span>;</span><br><span class="line"><span class="keyword">var</span> rx_three = <span class="regexp">/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g</span>;</span><br><span class="line"><span class="keyword">var</span> rx_four = <span class="regexp">/(?:^|:|,)(?:\s*\[)+/g</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> (</span><br><span class="line"> rx_one.test(</span><br><span class="line"> json</span><br><span class="line"> .replace(rx_two, <span class="string">"@"</span>)</span><br><span class="line"> .replace(rx_three, <span class="string">"]"</span>)</span><br><span class="line"> .replace(rx_four, <span class="string">""</span>)</span><br><span class="line"> )</span><br><span class="line">) {</span><br><span class="line"> <span class="keyword">var</span> obj = <span class="built_in">eval</span>(<span class="string">"("</span> +json + <span class="string">")"</span>);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="递归手动扫描每个字符"><a href="#递归手动扫描每个字符" class="headerlink" title="递归手动扫描每个字符"></a>递归手动扫描每个字符</h2><h2 id="new-Function-函数声明的传参形式"><a href="#new-Function-函数声明的传参形式" class="headerlink" title="new Function 函数声明的传参形式"></a>new Function 函数声明的传参形式</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> add = <span class="keyword">new</span> <span class="built_in">Function</span>(<span class="string">'a, b'</span>, <span class="string">'return a+b;'</span>);</span><br><span class="line"><span class="built_in">console</span>.log( add(<span class="number">2</span>, <span class="number">3</span>) ); <span class="comment">// 5</span></span><br></pre></td></tr></table></figure>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> jsonStr = <span class="string">'{ "age": 20, "name": "jack" }'</span>,</span><br><span class="line"> json = (<span class="keyword">new</span> <span class="built_in">Function</span>(<span class="string">'return '</span> + jsonStr))();</span><br></pre></td></tr></table></figure>
<h2 id="插入script"><a href="#插入script" class="headerlink" title="插入script"></a>插入script</h2><blockquote>
<p>模拟jsonP的方式拼接字符串然后以callBack的方式返回。</p>
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<p><span>本文标题:</span><a href="/%E5%A6%82%E4%BD%95%E7%94%A8js%E5%AE%9E%E7%8E%B0JSON.parse().html">如何用js实现JSON.parse()</a></p>
<p><span>文章作者:</span><a href="/" title="访问 陈宇（cosyer） 的个人博客">陈宇（cosyer）</a></p>
<p><span>发布时间:</span>2018年12月22日 - 23:12</p>
<p><span>最后更新:</span>2020年07月21日 - 23:07</p>
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<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#eval"><span class="nav-number">1.</span> <span class="nav-text">eval</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#对参数json进行校验防止xss漏洞"><span class="nav-number">1.1.</span> <span class="nav-text">对参数json进行校验防止xss漏洞</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#递归手动扫描每个字符"><span class="nav-number">2.</span> <span class="nav-text">递归手动扫描每个字符</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#new-Function-函数声明的传参形式"><span class="nav-number">3.</span> <span class="nav-text">new Function 函数声明的传参形式</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#插入script"><span class="nav-number">4.</span> <span class="nav-text">插入script</span></a></li></ol></div>
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