Carl Huang carlcarl

產生檔案

產生 1000 個 500kb 的隨機檔案

for i in {1..100000}; do head -c 500 /dev/urandom > dummy$i; done

產生隨機內容大檔案 (1G)

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.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

XSS 上課筆記

OWASP

Injection
Broken Authentication and Session Management
XSS

	// https://play.golang.org/p/DnGeQsaGfi
	package main

	import (
	"fmt"
	"reflect"
	)

	type Ogp struct {
	Title string

	Nginx使用者請看這

	由於Let's Encrypt的安裝程式目前還沒有提供nginx模組（其實有在開發，只是還在測試階段），我們依舊可以透過安裝程式自動取得certification後，手動更新nginx的設定黨即可。

	首先，我們先取得免費的憑證：

	# 如果nginx正在執行中，請先把它關閉
	$ sudo -s
	$ service nginx stop
	$ ./letsencrypt-auto certonly --email 你的email@你的email.net -d freessl.csie.io

	#! /usr/bin/env python3

	import asyncio
	import contextlib


	async def ping(ip):
	p = await asyncio.create_subprocess_exec('ping', '-c', '4', ip, stdout=asyncio.subprocess.PIPE)
	async for line in p.stdout:
	print(line)

	#!/bin/bash

	# Bash script to install latest version of ffmpeg and its dependencies on Ubuntu 12.04 or 14.04
	# Inspired from https://gist.github.com/faleev/3435377

	# Remove any existing packages:
	sudo apt-get -y remove ffmpeg x264 libav-tools libvpx-dev libx264-dev

	# Get the dependencies (Ubuntu Server or headless users):
	sudo apt-get update

	# 日本語用
	$ sudo apt-get install libncursesw5-dev

	# ソースコード取得
	$ git clone https://github.com/jonas/tig.git
	$ cd tig
	$ git checkout -b my-build-2.0.1 tig-2.0.1

	# ビルド, インストール
	$ LDLIBS=-lncursesw CFLAGS=-I/usr/include/ncursesw make install prefix=$HOME/local

	import asyncio

	@asyncio.coroutine
	def waiting(r):
	print("hello from waiting -", r)
	yield from asyncio.sleep(2)
	print("bye from waiting -", r)
	return r

	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf8">
	<title>Float Label Pattern</title>
	<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
	<style type="text/css" media="screen">
	.row {
	/position: relative;/
	padding-top: 24px;