x-yuri

Let's start with the basics of how X Window System works. X uses client-server model. An X server program runs on a computer with a graphical display and communicates with various client programs (X clients). The X server acts as a go-between for the user and the client programs, accepting requests for graphical output from the client programs and displaying them to the user (display), and receiving user input (keyboard, mouse) and transmitting it to the client programs.

In X, the server runs on the user's computer, while the clients may run on remote machines. This terminology reverses the common notion of client–server systems, where the client normally runs on the user's local computer and the server runs on the remote computer.

yeyuguo

{
  "xiaohongshu.com": "小红书",
  "vip.com": "唯品会",
  "douguo.com": "豆果美食",
  "youshu.cc": "有书",
  "missfresh.cn": "每日优鲜",
  "qnr.io": "去哪儿",
  "kaola.com": "网易考拉",
  "waimai.meituan.com": "美团外卖",
  "qcs.meituan.com": "美团打车",

337547038

判断滚动条的需求在弹窗插件中使用比较多，当弹窗添加overflow: hidden时，如果页面比较长的话，添加这个属性之后页面会有晃动。
为了增强用户体验，通过判断是否有滚动条而添加 margin-left 属性以抵消 overflow: hidden 之后的滚动条位置。

判断是否有滚动条的方法
function hasScrollbar() {
  return document.body.scrollHeight > (window.innerHeight || document.documentElement.clientHeight);
}

计算滚动条宽度的方法
新建一个带有滚动条的 div 元素，通过该元素的 offsetWidth 和 clientWidth 的差值即可获得

youfou

{
  "xiaohongshu.com": "小红书",
  "vip.com": "唯品会",
  "douguo.com": "豆果美食",
  "youshu.cc": "有书",
  "missfresh.cn": "每日优鲜",
  "qnr.io": "去哪儿",
  "kaola.com": "网易考拉",
  "waimai.meituan.com": "美团外卖",
  "qcs.meituan.com": "美团打车",

fedwatch

本文曾在“架构师之路”上发布过，近期支援Qcon-AS大会，在微信群里分享了该话题，故对原文进行重新整理与发布。

一、秒杀业务为什么难做
1）im系统，例如qq或者微博，每个人都读自己的数据（好友列表、群列表、个人信息）；
2）微博系统，每个人读你关注的人的数据，一个人读多个人的数据；
3）秒杀系统，库存只有一份，所有人会在集中的时间读和写这些数据，多个人读一个数据。
 
例如：小米手机每周二的秒杀，可能手机只有1万部，但瞬时进入的流量可能是几百几千万。
又例如：12306抢票，票是有限的，库存一份，瞬时流量非常多，都读相同的库存。读写冲突，锁非常严重，这是秒杀业务难的地方。那我们怎么优化秒杀业务的架构呢？
 

remarkablemark

# set the base image to Debian
# https://hub.docker.com/_/debian/
FROM debian:latest

# replace shell with bash so we can source files
RUN rm /bin/sh && ln -s /bin/bash /bin/sh

# update the repository sources list
# and install dependencies
RUN apt-get update \

yeyuguo

# coding: utf-8
# author: haofly
#
# fun: 生成随机姓名、随机电话号码、随机字符串，目前仅支持Python2

import random


def generateName(first_len=0, last_len=0):
    surnames = [

yeyuguo

    ,'._,`.              PYTHON SUCKS                                                 
   (-.___.-)               EVEN SANDNIGGERS CAN MASTER IT
   (-.___.-)                 DESPITE THE FACT THAT THIS IS OBVIOUSLY A COBRA                           
   `-.___.-'                                            
    ((  @ @|              .            __                                 
     \   ` |         ,\   |`.    @|   |  |      _.-._                     
    __`.`=-=mm===mm:: |   | |`.   |   |  |    ,'=` '=`.                   
   (    `-'|:/  /:/  `/  @| | |   |, @| @|   /---)W(---\                  
    \ \   / /  / /         @| |   '         (----| |----) ,~              
    |\ \ / /| / /            @|              \---| |---/  |               

vvgomes

var _ = require("lodash");
var R = require("ramda");

var companies = [
  { name: "tw", since: 1993 },
  { name: "pucrs", since: 1930 },
  { name: "tw br", since: 2009 }
];

var r1 = _(companies).chain()

plentz

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048