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/**
 * @param {Number} sec Sleep second period.
 */
function sleep(sec) {
    sec = +sec;
    if (isNaN(sec)) {
        throw new Error('sleep(): arg "sec" must be a number.');
    }
	
	const startTime = Date.now();

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/**
 * 依次读取文件 A、B、C
 */

/**
 * 4. async-await
 */
const fs = require('fs'),
    promisedReadFile = util.promisify(fs.readFile); // util.promisify: Node v8.x.x 新增 API

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封装环境：nginx + node.js + mysql + redis + memcached + php + php-fpm

配置文件路径：
    /etc/ssh/sshd_config
    /etc/nginx/
    /etc/my.cnf (/etc/mysql/my.cnf /usr/local/mysql/my.cnf ~/.my.cnf)
    /etc/redis/
    /etc/php.ini > /usr/local/etc/php5214.ini
    /etc/php-fpm.conf
远程

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译自 jQuery Plugins / Authoring

创建插件

---

看来 jQuery 你已经用得很爽了，想学习如何自己编写插件。非常好，这篇文档正适合你。用插件和方法来扩展 jQuery 非常强大，把最聪明的功能封装到插件中可以为你及团队节省大量开发时间。

开始

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# extra/httpd-default.conf

# 这个配置文件展示 Apache HTTP Server 的默认设置
#
# 你可能变更这些，但是一般情况下你并不需要更改

# Timeout：收发超时前的秒数
Timeout 60

# KeepAlive：是否允许持续连接（每个连接可以有多次请求）—— 即不立即分手

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<script\x20type="text/javascript">javascript:alert(1);</script>
<script\x3Etype="text/javascript">javascript:alert(1);</script>
<script\x0Dtype="text/javascript">javascript:alert(1);</script>
<script\x09type="text/javascript">javascript:alert(1);</script>
<script\x0Ctype="text/javascript">javascript:alert(1);</script>
<script\x2Ftype="text/javascript">javascript:alert(1);</script>
<script\x0Atype="text/javascript">javascript:alert(1);</script>
'`"><\x3Cscript>javascript:alert(1)</script>        
'`"><\x00script>javascript:alert(1)</script>
<img src=1 href=1 onerror="javascript:alert(1)"></img>

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What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

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IE 6

* html .ie6 {property:value;}

or

.ie6 { _property:value;}

IE 7

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const http = require('http')
const url = require('url')
const path = require('path')
const fs = require('fs')
const mime = {
  "html": "text/html",
  "css": "text/css",
  "js": "text/javascript",
  "json": "application/json",
  "gif": "image/gif",

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// Wikipedia telnet server
//
// To install depenedncies:
// npm install request
// npm install cheerio
//

var net = require( 'net' );
var cheerio = require('cheerio');
var request = require('request');