深入NodeJS模块os - 与操作系统“打交道”

2019/04/10 10:10
阅读数 15

<section id="nice" data-tool="mdnice编辑器" data-website="https://www.mdnice.com" style="font-size: 16px; color: black; padding: 10px; line-height: 1.6; word-spacing: 0px; letter-spacing: 0px; word-break: break-word; word-wrap: break-word; text-align: left; font-family: Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, 'PingFang SC', Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;"><figure data-tool="mdnice编辑器" style="margin: 0; margin-top: 10px; margin-bottom: 10px;"><img src="https://tva1.sinaimg.cn/large/006tNbRwly1gb0qoh8vpwj30xc0gomxw.jpg" alt style="display: block; margin: 0 auto; width: 100%;"></figure> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">读了 <code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">os</code> 模块的文档,研究了几个有意思的问题:</p> <ul data-tool="mdnice编辑器" style="margin-top: 8px; margin-bottom: 8px; padding-left: 25px; color: black; list-style-type: disc;"> <li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">🤔 识别操作系统平台</section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">🤔 理解和计算“平均负载”</section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">🤔 理解和计算“cpu 使用率”</section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">🤔 理解和计算“内存使用率”</section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">🤔 查看运行时间</section></li></ul> <h2 data-tool="mdnice编辑器" style="margin-top: 40px; margin-bottom: 20px; font-weight: bold; color: black; font-size: 24px; margin: 10px auto; height: 40px; background-color: rgb(251, 251, 251); border-bottom: 1px solid rgb(246, 246, 246); overflow: hidden; box-sizing: border-box;"><span style="margin-left: -10px; display: inline-block; width: auto; height: 40px; background-color: rgb(33, 33, 34); border-bottom-right-radius: 100px; color: rgb(255, 255, 255); padding-right: 30px; padding-left: 30px; line-height: 40px; font-size: 16px;">识别操作系统平台</span></h2> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">nodejs 提供了<code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">os.platform()</code>和<code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">os.type()</code>,可以用来识别操作系统平台。推荐使用: <code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">os.platform()</code></p> <h2 data-tool="mdnice编辑器" style="margin-top: 40px; margin-bottom: 20px; font-weight: bold; color: black; font-size: 24px; margin: 10px auto; height: 40px; background-color: rgb(251, 251, 251); border-bottom: 1px solid rgb(246, 246, 246); overflow: hidden; box-sizing: border-box;"><span style="margin-left: -10px; display: inline-block; width: auto; height: 40px; background-color: rgb(33, 33, 34); border-bottom-right-radius: 100px; color: rgb(255, 255, 255); padding-right: 30px; padding-left: 30px; line-height: 40px; font-size: 16px;">理解和计算“平均负载”</span></h2> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">平均负载是指:单位时间内,系统处于可运行状态和不可中断状态的平均进程数。它和 cpu 使用率没有直接关系。</p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">其中,这里的可运行状态指的是:正在使用 cpu 或正在等待 cpu 的进程。不可中断状态指的是:内核态关键流程中的进程。</p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">在 nodejs 中,直接调用<code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">os.loadavg()</code>可以获得 1、5 和 15 分钟的平均负载,它和 unix 命令<code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">uptime</code>返回值一样。</p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;"><strong style="font-weight: bold; color: black;">为什么需要关心平均负载这个问题呢</strong>?因为进程分为 2 种,第一种就是“CPU 密集型”,它的 cpu 使用率和平均负载都是高的;第二种是“IO 密集型”,它的 cpu 使用率不一定高,但是等待 IO 会造成平均负载高。所以,cpu 使用率和平均负载共同反应系统性能。</p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">平均活跃进程数最理想的状态是 cpu 数量=平均负载,如果 cpu 数量 &lt; 平均负载,那么平均负载过高。</p> <pre class="custom" data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px;"><code class="hljs" style="overflow-x: auto; padding: 16px; color: #333; background: #f8f8f8; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; border-radius: 0px; font-size: 12px; -webkit-overflow-scrolling: touch;"><span class="hljs-comment" style="color: #998; font-style: italic; line-height: 26px;">// 判断是否平均负载过高</span> <span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">function</span> <span class="hljs-title" style="color: #900; font-weight: bold; line-height: 26px;">isHighLoad</span>(<span class="hljs-params" style="line-height: 26px;"></span>) </span>{ <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">const</span> cpuNum = os.cpus().length; <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">return</span> os.loadavg().map(<span class="hljs-function" style="line-height: 26px;"><span class="hljs-params" style="line-height: 26px;">item</span> =&gt;</span> item &gt; cpuNum); } </code></pre> <h2 data-tool="mdnice编辑器" style="margin-top: 40px; margin-bottom: 20px; font-weight: bold; color: black; font-size: 24px; margin: 10px auto; height: 40px; background-color: rgb(251, 251, 251); border-bottom: 1px solid rgb(246, 246, 246); overflow: hidden; box-sizing: border-box;"><span style="margin-left: -10px; display: inline-block; width: auto; height: 40px; background-color: rgb(33, 33, 34); border-bottom-right-radius: 100px; color: rgb(255, 255, 255); padding-right: 30px; padding-left: 30px; line-height: 40px; font-size: 16px;">理解和计算“cpu 使用率”</span></h2> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">很多监控软件都提供针对 cpu 使用率的“实时”监控,当然这个实时不是真的实时,有个时间差。这个功能,nodejs 如何实现呢?</p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;"><strong style="font-weight: bold; color: black;">第一步</strong>:封装<code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">getCPUInfo()</code>,计算获取 cpu 花费的总时间与空闲模式花费的时间。</p> <pre class="custom" data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px;"><code class="hljs" style="overflow-x: auto; padding: 16px; color: #333; background: #f8f8f8; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; border-radius: 0px; font-size: 12px; -webkit-overflow-scrolling: touch;"><span class="hljs-comment" style="color: #998; font-style: italic; line-height: 26px;">/** * 获取cpu花费的总时间与空闲模式的时间 */</span> <span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">function</span> <span class="hljs-title" style="color: #900; font-weight: bold; line-height: 26px;">getCPUInfo</span>(<span class="hljs-params" style="line-height: 26px;"></span>) </span>{ <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">const</span> cpus = os.cpus(); <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">let</span> user = <span class="hljs-number" style="color: #008080; line-height: 26px;">0</span>, nice = <span class="hljs-number" style="color: #008080; line-height: 26px;">0</span>, sys = <span class="hljs-number" style="color: #008080; line-height: 26px;">0</span>, idle = <span class="hljs-number" style="color: #008080; line-height: 26px;">0</span>, irq = <span class="hljs-number" style="color: #008080; line-height: 26px;">0</span>, total = <span class="hljs-number" style="color: #008080; line-height: 26px;">0</span>;

cpus.forEach(<span class="hljs-function" style="line-height: 26px;"><span class="hljs-params" style="line-height: 26px;">cpu</span> =&gt;</span> {
    <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">const</span> { times } = cpu;
    user += times.user;
    nice += times.nice;
    sys += times.sys;
    idle += times.idle;
    irq += times.irq;
});

total = user + nice + sys + idle + irq;

<span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">return</span> {
    total,
    idle
};

} </code></pre>

<p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;"><strong style="font-weight: bold; color: black;">第二步</strong>:当前时间点 t1,选定一个时间差 intervel,计算 t1 和 t1 + interval 这两个时间点的 cpu 时间差与空闲模式时间差,返回 <code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">1 - 空闲时间差 / cpu时间差</code>。返回的结果就是时间差 intervel 内的平均 cpu 使用率。</p> <pre class="custom" data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px;"><code class="hljs" style="overflow-x: auto; padding: 16px; color: #333; background: #f8f8f8; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; border-radius: 0px; font-size: 12px; -webkit-overflow-scrolling: touch;"><span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">function</span> <span class="hljs-title" style="color: #900; font-weight: bold; line-height: 26px;">getCPUUsage</span>(<span class="hljs-params" style="line-height: 26px;">interval = <span class="hljs-number" style="color: #008080; line-height: 26px;">1000</span></span>) </span>{ <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">const</span> startInfo = getCPUInfo();

<span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">return</span> <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">new</span> <span class="hljs-built_in" style="color: #0086b3; line-height: 26px;">Promise</span>(<span class="hljs-function" style="line-height: 26px;"><span class="hljs-params" style="line-height: 26px;">resolve</span> =&gt;</span> {
    setTimeout(<span class="hljs-function" style="line-height: 26px;"><span class="hljs-params" style="line-height: 26px;">()</span> =&gt;</span> {
        <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">const</span> endInfo = getCPUInfo();

        <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">const</span> idleDiff = startInfo.idle - endInfo.idle;
        <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">const</span> totalDiff = startInfo.total - endInfo.total;
        resolve(<span class="hljs-number" style="color: #008080; line-height: 26px;">1</span> - <span class="hljs-built_in" style="color: #0086b3; line-height: 26px;">Math</span>.abs(idleDiff / totalDiff));
    }, interval);
});

} </code></pre>

<p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">使用方式如下:</p> <pre class="custom" data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px;"><code class="hljs" style="overflow-x: auto; padding: 16px; color: #333; background: #f8f8f8; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; border-radius: 0px; font-size: 12px; -webkit-overflow-scrolling: touch;">getCPUUsage().then(<span class="hljs-function" style="line-height: 26px;"><span class="hljs-params" style="line-height: 26px;">usage</span> =&gt;</span> <span class="hljs-built_in" style="color: #0086b3; line-height: 26px;">console</span>.log(<span class="hljs-string" style="color: #d14; line-height: 26px;">"cpu使用率:"</span>, usage)); </code></pre> <h2 data-tool="mdnice编辑器" style="margin-top: 40px; margin-bottom: 20px; font-weight: bold; color: black; font-size: 24px; margin: 10px auto; height: 40px; background-color: rgb(251, 251, 251); border-bottom: 1px solid rgb(246, 246, 246); overflow: hidden; box-sizing: border-box;"><span style="margin-left: -10px; display: inline-block; width: auto; height: 40px; background-color: rgb(33, 33, 34); border-bottom-right-radius: 100px; color: rgb(255, 255, 255); padding-right: 30px; padding-left: 30px; line-height: 40px; font-size: 16px;">理解和计算“内存使用率”</span></h2> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">cpu 的指标有平均负载、cpu 使用率,内存的指标有内存使用率。</p> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">借助 nodejs 接口,实现非常简单:</p> <pre class="custom" data-tool="mdnice编辑器" style="margin-top: 10px; margin-bottom: 10px;"><code class="hljs" style="overflow-x: auto; padding: 16px; color: #333; background: #f8f8f8; display: -webkit-box; font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; border-radius: 0px; font-size: 12px; -webkit-overflow-scrolling: touch;"><span class="hljs-function" style="line-height: 26px;"><span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">function</span> <span class="hljs-title" style="color: #900; font-weight: bold; line-height: 26px;">getMemUsage</span>(<span class="hljs-params" style="line-height: 26px;"></span>) </span>{ <span class="hljs-keyword" style="color: #333; font-weight: bold; line-height: 26px;">return</span> <span class="hljs-number" style="color: #008080; line-height: 26px;">1</span> - os.freemem() / os.totalmem(); } </code></pre> <h2 data-tool="mdnice编辑器" style="margin-top: 40px; margin-bottom: 20px; font-weight: bold; color: black; font-size: 24px; margin: 10px auto; height: 40px; background-color: rgb(251, 251, 251); border-bottom: 1px solid rgb(246, 246, 246); overflow: hidden; box-sizing: border-box;"><span style="margin-left: -10px; display: inline-block; width: auto; height: 40px; background-color: rgb(33, 33, 34); border-bottom-right-radius: 100px; color: rgb(255, 255, 255); padding-right: 30px; padding-left: 30px; line-height: 40px; font-size: 16px;">查看运行时间</span></h2> <ul data-tool="mdnice编辑器" style="margin-top: 8px; margin-bottom: 8px; padding-left: 25px; color: black; list-style-type: disc;"> <li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">nodejs 运行时间:<code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">process.uptime()</code></section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">系统运行时间:<code style="font-size: 14px; word-wrap: break-word; padding: 2px 4px; border-radius: 4px; margin: 0 2px; background-color: rgba(27,31,35,.05); font-family: Operator Mono, Consolas, Monaco, Menlo, monospace; word-break: break-all; color: rgb(239, 112, 96);">os.uptime()</code></section></li></ul> <h2 data-tool="mdnice编辑器" style="margin-top: 40px; margin-bottom: 20px; font-weight: bold; color: black; font-size: 24px; margin: 10px auto; height: 40px; background-color: rgb(251, 251, 251); border-bottom: 1px solid rgb(246, 246, 246); overflow: hidden; box-sizing: border-box;"><span style="margin-left: -10px; display: inline-block; width: auto; height: 40px; background-color: rgb(33, 33, 34); border-bottom-right-radius: 100px; color: rgb(255, 255, 255); padding-right: 30px; padding-left: 30px; line-height: 40px; font-size: 16px;">参考链接</span></h2> <ul data-tool="mdnice编辑器" style="margin-top: 8px; margin-bottom: 8px; padding-left: 25px; color: black; list-style-type: disc;"> <li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;"><a href="http://nodejs.cn/api/os.html" style="text-decoration: none; word-wrap: break-word; font-weight: bold; color: rgb(239, 112, 96); border-bottom: 1px solid rgb(239, 112, 96);">Node.js os doc</a></section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;"><a href="https://www.npmjs.com/package/os-utils" style="text-decoration: none; word-wrap: break-word; font-weight: bold; color: rgb(239, 112, 96); border-bottom: 1px solid rgb(239, 112, 96);">第三方扩展库:os-utils</a></section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;"><a href="https://www.cnblogs.com/heruiguo/articles/10797249.html" style="text-decoration: none; word-wrap: break-word; font-weight: bold; color: rgb(239, 112, 96); border-bottom: 1px solid rgb(239, 112, 96);">怎么理解平均负载(一)</a></section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;"><a href="https://blog.csdn.net/sunflower_della/article/details/90439935" style="text-decoration: none; word-wrap: break-word; font-weight: bold; color: rgb(239, 112, 96); border-bottom: 1px solid rgb(239, 112, 96);">字节序(大小端)理解</a></section></li></ul> <h2 data-tool="mdnice编辑器" style="margin-top: 40px; margin-bottom: 20px; font-weight: bold; color: black; font-size: 24px; margin: 10px auto; height: 40px; background-color: rgb(251, 251, 251); border-bottom: 1px solid rgb(246, 246, 246); overflow: hidden; box-sizing: border-box;"><span style="margin-left: -10px; display: inline-block; width: auto; height: 40px; background-color: rgb(33, 33, 34); border-bottom-right-radius: 100px; color: rgb(255, 255, 255); padding-right: 30px; padding-left: 30px; line-height: 40px; font-size: 16px;">放在最后</span></h2> <ol data-tool="mdnice编辑器" style="margin-top: 8px; margin-bottom: 8px; padding-left: 25px; color: black; list-style-type: decimal;"> <li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">觉得不错,<strong style="font-weight: bold; color: black;">帮忙点个推荐呗</strong>,您的支持是对我最大的激励</section></li><li><section style="margin-top: 5px; margin-bottom: 5px; line-height: 26px; text-align: left; color: rgb(1,1,1); font-weight: 500; font-size: 15px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif;">欢迎我的公众号:<strong style="font-weight: bold; color: black;">「心谭博客」</strong>,只专注于<strong style="font-weight: bold; color: black;">前端</strong> + <strong style="font-weight: bold; color: black;">算法</strong>的原创分享</section></li></ol> <p data-tool="mdnice编辑器" style="padding-top: 8px; padding-bottom: 8px; margin: 0; color: black; box-sizing: border-box; margin-bottom: 16px; font-family: 'Helvetica Neue', Helvetica, 'Segoe UI', Arial, freesans, sans-serif; font-size: 15px; text-align: start; white-space: normal; text-size-adjust: auto; line-height: 1.75em;">由于个人精力有限,很多系列和历史文章没有即时同步,<strong style="font-weight: bold; color: black;">请前往<a href="https://xxoo521.com/frontend/" style="text-decoration: none; word-wrap: break-word; font-weight: bold; color: rgb(239, 112, 96); border-bottom: 1px solid rgb(239, 112, 96);">「前端图谱」</a>&amp;<a href="https://xxoo521.com/algorithm/" style="text-decoration: none; word-wrap: break-word; font-weight: bold; color: rgb(239, 112, 96); border-bottom: 1px solid rgb(239, 112, 96);">「算法题解」</a></strong>,保证您有所收获。</p> </section>

原文出处:https://www.cnblogs.com/geyouneihan/p/12242381.html

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