更改javascript数组格式

Question

I want to create a linear javascript array like this:

A = ["1","2","3"];
B = ["4","5","6"];

From Data that is already a long javascript array but is formatted like this:

var A = [];
var B = [];
A[0] = "1";
B[0] = "4";
A[1] = "2";
B[1] = "5";
A[2] = "3";
B[2] = "6";

What is the easiest way to convert the javascript array from the 2nd example to the 1st?

With the code in the 1st format the filesize is smaller, and the data easier to edit.

Answer 1

Just put the second code in the console and then type

console.log('var A =', A);
console.log('var B =', B);

you will get in the console the text you need to paste back in your code..

If your variables are global try running

console.clear();
for (var global in window){
    if (window.hasOwnProperty(global)){
        if (Array.isArray(window[global])){
           console.log( 'var',global, '=', window[global] );
        }
    }
}

after your script. ( it might show other arrays as well, just copy those you want.. )

Answer 2

You can get the short text form of any object using the JSON.stringify ^[MDN] function:

JSON.stringify(A);
// returns '["1","2","3"]';

Answer 3

maybe you should do something like this and copy paste the string from the console:

var A = [];
var B = [];
A[0] = "1";
B[0] = "4";
A[1] = "2";
B[1] = "5";
A[2] = "3";
B[2] = "6";

function getOutputStr(arr) {
    var output = '[';
    for (var i = 0; i < arr.length; i++) {
        output += '"' + arr[i] + '",'
    }

    output = output.substring(0, output.length - 1);
    output += ']';
    return output;
}
console.log(getOutputStr(A));
console.log(getOutputStr(B));

Fiddle