구차니의 잡동사니 모음

var formData = new FormData();

formData.append('key1', 'value1');

formData.append('key2', 'value2');

// Display the key/value pairs

for (var pair of formData.entries()) {

    console.log(pair[0]+ ', ' + pair[1]); 

} 

var formData = new FormData();

formData.append('items', new Blob([JSON.stringify({

    name: "Book",

    quantity: "12"

})], {

    type: "application/json"

})); 

var st = imagepath.replace(data:image/png or jpg; base64"/""); 

$.when(ajax1(), ajax2(), ajax3(), ajax4()).done(function(a1, a2, a3, a4){

    // the code here will be executed when all four ajax requests resolve.

    // a1, a2, a3 and a4 are lists of length 3 containing the response text,

    // status, and jqXHR object for each of the four ajax calls respectively.

});

function ajax1() {

    // NOTE:  This function must return the value 

    //        from calling the $.ajax() method.

    return $.ajax({

        url: "someUrl",

        dataType: "json",

        data:  yourJsonData,            

        ...

    });

} 

function toHexString(byteArray) {

  return Array.from(byteArray, function(byte) {

    return ('0' + (byte & 0xFF).toString(16)).slice(-2);

  }).join('')

} 

if (typeof query !== 'undefined' && query !== null){

   doStuff();

} 

var ip = require("ip");

console.dir ( ip.address() ); 

$ cat uuid.c

#include <uuid/uuid.h>

#include <stdio.h>

void main()

{

        uuid_t out;

        uuid_generate_random(out);

        printf("%x",out);

}

$ gcc uuid.c -luuid

 typedef unsigned char uuid_t[16];