[译]在Javascript中制造二维数列

本文翻译youtube上的up主kudvenkat的javascript tutorial播放单

源地址在此:

https://www.youtube.com/watch?v=PMsVM7rjupU&list=PL6n9fhu94yhUA99nOsJkKXBqokT3MBK0b

Javascript中并不存在直接制造二维数列的方法,所以我们其实只是制作一个包含着数列的数列而已

例子:以下的Javascript代码制造一个3x3的二维数列

for (i=0; i [ 3; i++)
myArray1[i]=new Array(3)

myArray1[0][0] = "1"
myArray1[0][1] = "2"
myArray1[0][2] = "3"

myArray1[1][0] = "4"
myArray1[1][1] = "5"
myArray1[1][2] = "6"

myArray1[2][0] = "7"
myArray1[2][1] = "8"
myArray1[2][2] = "9"

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j [<3; j++)
    {
        document.write(myArray1[i][j] + "&emsp;");
    }
    document.write("[br/]");
}

在例1中,我们亲手在数列中的每个储存位置填充了元素,而在以下的例子中,我们用2个嵌套for循环来达到以上的效果

var myArray1 = new Array(3)

for (i=0; i [ 3; i++)
myArray1[i]=new Array(3)

var start = 1;

for (var i = 0; i <3; i++)
{
    for (var j = 0; j [<3; j++)
    {
        myArray1[i][j] = start;
        start = start + 1;
    }
}

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 3; j++)
    {
        document.write(myArray1[i][j] + "&emsp;");
    }
    document.write("[br/]");
}

在两个二维数列中进行加法运算

例子:

第一个3x3的数列必须包含从1到9的数字

第二个3x3的数列必须包含从9到1的数字

在第一个和第二个数列中index相同位置的数目必须进行相加运算,然后将结果存储到第三个3x3的数列中

// Create the first 2 dimensional 3 X 3 array
var myArray1 = new Array(3)

for (i=0; i < 3; i++)
myArray1[i]=new Array(3)

var start = 1;

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 3; j++)
    {
        myArray1[i][j] = start;
        start = start + 1;
    }
}

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 3; j++)
    {
        document.write(myArray1[i][j] + "&emsp;");
    }
    document.write("<br/>");
}

document.write("<br/>");
document.write("&emsp;+");
document.write("<br/>");
document.write("<br/>");

// Create the second 2 dimensional 3 X 3 array
var myArray2 = new Array(3)

for (i = 0; i < 3; i++)
    myArray2[i] = new Array(3)

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 3; j++)
    {
        start = start - 1;
        myArray2[i][j] = start;
    }
}

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 3; j++)
    {
        document.write(myArray2[i][j] + "&emsp;");
    }
    document.write("<br/>");
}

document.write("<br/>");
document.write("&emsp;=");
document.write("<br/>");
document.write("<br/>");

// Create the third 2 dimensional 3 X 3 array
var myArray3 = new Array(3)

for (i = 0; i [ 3; i++)
    myArray3[i] = new Array(3)

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 3; j++)
    {
        myArray3[i][j] = myArray1[i][j] + myArray2[i][j];
    }
}

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 3; j++)
    {
        document.write(myArray3[i][j] + "&emsp;");
    }
    document.write("<br/>");
}

Creating a 2 dimensional 3 X 5 array

var myArray1 = new Array(3)

for (i=0; i < 3; i++)
myArray1[i]=new Array(5)

var start = 101;

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 5; j++)
    {
        myArray1[i][j] = start;
        start = start + 1;
    }
}

for (var i = 0; i < 3; i++)
{
    for (var j = 0; j < 5; j++)
    {
        document.write(myArray1[i][j] + "&emsp;");
    }
    document.write("<br/>");
}