How to output a two-dimensional array with 4 rows and 3 columns in JavaScript

In JavaScript, you can use a double-layer for loop and write() to output a two-dimensional array with 4 rows and 3 columns. The syntax is "for(var i=0;i

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript outputs a two-dimensional array with 4 rows and 3 columns

Here is a two-dimensional array with 4 rows and 3 columns:

var a = [  //定义二维数组
    [1.1, 1.2, 1.3, 1.4],
    [2.1, 2.2, 2.3, 2.4],
    [3.1, 3.2, 3.3, 3.4]
];

Let’s take a look at how to output:

Method: Use a double-layer for loop

The outer for loop controls the number of rows, and the memory for Loop control column number

Implementation code:

<script type="text/javascript">
var a = [  //定义二维数组
    [1.1, 1.2, 1.3, 1.4],
    [2.1, 2.2, 2.3, 2.4],
    [3.1, 3.2, 3.3, 3.4]
];
	for(var i=0;i<=4;i++){
		for(var j=0;j<=3;j++){
			document.write(a[i][j]+"  ");
		}
		document.write("<br>");
	}
</script>

Output result:

[Recommended learning ：javascript advanced tutorial】

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