为什么console.log（）和document.write（）在JavaScript中为二维数组输出不同的结果？

Question

I'm trying to understand the ins and outs of a two-dimensional arrays in JavaScript. While debugging I've noticed a difference in the values when outputting with console.log() and document.write().

I understand I should be using console.log(), however it seems I could only get document.write() to output what I was expecting.

var x = [];
  for (var i = 0; i < 5; i++) {
    x[i] = new Array(1);           
  }
    x[0][0] = "A";
    x[0][1] = "Apple";
    x[1][0] = "B";
    x[1][1] = "Banana";
    x[2][0] = "C";
    x[2][1] = "Cumquats";
    x[3][0] = "D";
    x[3][1] = "Dewberry";
    x[4][0] = "E";
    x[4][1] = "Elderberry";

document.write(x);
console.log(x);

I see the following from document.write(x) :

A,Apple,B,Banana,C,Cumquats,D,Dewberry,E,Elderberry

I see the following from console.log(x) :

[Array[2], Array[2], Array[2], Array[2], Array[2]]

Answer 1

By my understanding, console is different based on the vendor of the browser. Logging in Firefox gives a different result than with Chrome. Document.write is a Javascript method that has a certain implementation across all browsers, like trim() or any other method.

Because log() is used for development purposes, it doesn't matter how the data is output, so long as it's useful to developers.

Answer 2

The answer to this is extremely simple: Chrome minimizes arrays, each of those is an array with two items. Click on it for it to reveal the content.