Javascript object keys listing (no matter enumerable or not)

function objls(obj)
      {
          let objO=obj;
          let listK={};
          while(obj!=null)
            {
                Object.getOwnPropertyNames(obj).forEach(i=>{
                    listK[i]=1;
                });
                obj=obj.__proto__;
            }
          let ret=Object.keys(listK);
          let oname=objO.constructor.name;
          if(oname=="Number")
            ret.unshift(objO);
          else if(oname=="String")
            ret.unshift(objO.substr(0,1000));
          else if(oname=="Array")
            ret.unshift(objO.slice(0,10).join(","));

          ret.unshift(objO.constructor.name);
          return ret;
      }





alert(objls(performance));

Zip/Unzip folder in Node.js

First, install jszip by npm install jszip, then paste the following code

Then you can use genZip("folder/to/zip","abc.zip") and extractZip("abc.zip","folder/to/extract/to") as promises to zip/unzip your folder

You can also pass an Array to genZip's first argument to zip multiple files and folders

Copy to Clipboard

 function cbcopy(s){

  obj=document.createElement("textarea");

  obj.value=(s+"");

  document.body.append(obj);

  obj.select();

  document.execCommand("copy");

  obj.remove();

}

hello world

Web crawling By Puppeteer @ Node.js - Part 2/2, How to make it work on Android?

Outlines

1. Install ubuntu on Android by AndroNix
2. Install node.js and puppeteer
3. start web crawling
4. advanced adjustments to display chinese characters

Web crawling By Puppeteer @ Node.js - Part 1/2

# Introduction

• Puppeteer is a node.js library that achieves web crawling by an automated chromium browser (chrome open source project)
• Unlike other methods needing to send pure http requests and parse responses yourself, even needing to handle cookies manually, your syntax is simply: 
• Launch browser -> emulate real user operations on the web page -> get any data that is reachable by a real user

Web crawling by puppeteer is very simple.

This is part 1/2, in part 2/2 I'll demonstrate how to make it work on Android

# Getting Started

Start by installing:

• npm install puppeteer