| // Available variables: | |
| // - Machine | |
| // - interpret | |
| // - assign | |
| // - send | |
| // - sendParent | |
| // - spawn | |
| // - raise | |
| // - actions |
| import generate from "@babel/generator"; | |
| import {parse} from "@babel/parser"; | |
| import traverse from "@babel/traverse"; | |
| import {identifier, isIdentifier, isMemberExpression, memberExpression} from "@babel/types"; | |
| import * as fs from 'fs' | |
| const file = process.argv[2] | |
| const ast = parse(fs.readFileSync(file, 'utf-8’)) // 解析得到 ast | |
| traverse(ast, { | |
| CallExpression(path) { // 当遍历到“调用表达式”时进入此回调 | |
| if (isMemberExpression(path.node.callee) && // 被调用的函数来自一个成员表达 |
| #!/usr/bin/env node | |
| const files = process.argv.slice(2) | |
| const cmds = files.map(f => | |
| `ffmpeg -i ${f} -filter:v "setpts=PTS/30" -crf 20 -r 30 -an -threads 1 -y -vcodec libx264 ${f}.collapse.flv`) | |
| console.log(cmds.join('\n')) |
| console.time("Array.push"); | |
| const array = []; | |
| for (var i = 0; i < 1e7; i++) array[i] = i; | |
| console.timeEnd("Array.push"); | |
| console.time("new Array.push"); | |
| const array1 = new Array(1e7); | |
| for (var i = 0; i < 1e7; i++) array1[i] = i; | |
| console.timeEnd("new Array.push"); |
| [alias] | |
| st = status | |
| ci = commit | |
| co = checkout | |
| dt = difftool | |
| lg = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen%cr %C(bold blue)<%an>%Creset' | |
| lp = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen%cr %C(bold blue)<%an>%Creset' | |
| ca = commit -a | |
| [color] | |
| ui = auto |
When hosting our web applications, we often have one public IP
address (i.e., an IP address visible to the outside world)
using which we want to host multiple web apps. For example, one
may wants to host three different web apps respectively for
example1.com, example2.com, and example1.com/images on
the same machine using a single IP address.
How can we do that? Well, the good news is Internet browsers
Go to the egghead website, i.e. Building a React.js App
run
var links = $('h4 a').get().map(function(a){ return a.href}).join('\n')
copy(links)
| ffmpeg -i "17 Audio Track.aiff" -f mp3 -acodec libmp3lame -ab 192000 -ar 44100 17.mp3 |
| vcl 4.0; | |
| acl purgers { | |
| "localhost"; | |
| "127.0.0.1"; | |
| "192.168.199.0"/24; | |
| } | |
| backend default { | |
| .host = "localhost"; |
| # you should download the files in m3u8 file first | |
| ffmpeg -i the.file.m3u8 -acodec copy -vcodec copy -y -loglevel info -bsf:a aac_adtstoasc -f mp4 your-mp4-file.mp4 | |
| # First 10 Minutes | |
| ffmpeg -i VIDEO_SOURCE.mp4 -vcodec copy -acodec copy -ss 0 -t 00:10:00 VIDEO_PART_1.mpg | |
| # Second 10 Minutes | |
| ffmpeg -i VIDEO_SOURCE.mp4 -vcodec copy -acodec copy -ss 00:10:00 -t 00:20:00 VIDEO_PART_2.mpg | |
| # Rest after the first 20 Minutes | |
| ffmpeg -i VIDEO_SOURCE.mp4 -vcodec copy -acodec copy -ss 00:20:00 VIDEO_PART_3.mpg |