https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-mongodb-on-ubuntu-16-04?fbclid=IwAR0j2APdeVoL-8lQtql7o12_j3CR57d6nDEKVJMehWU9Zyrpg7n_aNQwdDI
mongo
show dbs
mongo -u nicole -p --authenticationDatabase admin
— Configuring
sudo systemctl restart mongod
sudo systemctl status mongod
— Testing the Remote Connection
mongo -u AdminSammy -p --authenticationDatabase admin --host IP_address_of_MongoHost
Start MongoDB
$ sudo service mongod start
【mong|mong , Flask】Stop MongoDB.
$ sudo service mongod stop
Restart MongoDB.
$ sudo service mongod restart
================MongoDB Command ======================
use DATABASE_NAME
show dbs
insert many document
https://docs.mongodb.com/manual/tutorial/insert-documents/
youtube
https://www.youtube.com/watch?v=Phe9B2HRVmc
stackoverflow
https://stackoverflow.com/questions/11609647/import-more-than-1-json-file-using-mongoimport
github
https://gist.github.com/fabien0102/88dcaa184d801fd5e67a
ls -1 *.json | while read jsonfile; do mongoimport -d support -c logs -file $jsonfile --jsonArray -type json; done
--Import all files from a folder:
ls *.json | xargs -I filename
mongoimport -d targetDatabase -c targetCollection --file /home/myFiles/myJsonFile.json-u username -p password --authenticationDatabase admin
===================================
get web
wget URL (RAW DATA)
history | word
git clone
rm *.md
=======================================================================
AJAX：-> javascript 得到URL的 JSON content
var ourRequest = new XMLHttpRequest()
ourRequest.open('Get', 'https://learnwebcode.github.io/json-example/animals');
ourRequest.onload = function() {
var ourDate = JSON.parse(ourRequest.responseText)；
console.log( ourData[0]);
}
ourRequest.send();
================================================

var pageCounter = 1; var animalContainer = document.getElementById("animal-info"); AjAx: -> javascript 监听clicker var btn = document.getElementById("btn"); btn.addEventListener("click" ,function(){ var ourRequest = new XMLHttpRequest() ourRequest.open('Get', 'https://learnwebcode.github.io/json-example/animals-' + pageCounter + '.json'); ourRequest.onload = function() { if(ourRequed=st.status >= 200 && ourRequest < 400) { // request 成功 var ourDate =JSON.parse(ourRequest.responseText)； //console.log( ourData[0]); renderHTML( outData); }else { console.log("we connect to the server , but it returned an error"); }}// ourRequest.onload // handle the error request ourRequest.onerror = function(){ console.log("connectin error "); } ourRequest.send(); pangCounter ++; if( pageCounter > 3) { btn.classList.add( "hide-me"); } } ); function renderHTML( data) { varhtmlString = " "; for( i =0; i < data.length; i++) { htmlString +="" + data[i].name + " is a "+ data[i].specise + "likes to eat " + ; for( ii=0; ii