JS realizes the symmetrical multiplication table of up, down, left and right

JS realizes the symmetrical multiplication table of up, down, left and right_javascript skills

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Release： 2016-05-16 15:14:30

Original

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The multiplication table can be implemented in many languages. This article describes two commonly used loops (For, While) in JavaScript to complete these four symmetrical multiplication tables. This example is a good way to practice the basics of loops. Because the layout is not neat, a table is looped .

1. Trapezoidal multiplication table with the lower left corner in degrees:

For loop code

document.write("<table width='' border='>");
for(var i=; i<=; i++){
document.write("<tr>");
for(var j=; j<=i; j++){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
}
document.write("</tr>");
}
document.write("</table>");

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While loop code

document.write("<table width='' border='>");
var i = ;
while(i<=){
document.write("<tr>");
var j = ;
while(j<=i){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
j++;
}
document.write("</tr>");
i++;
}
document.write("</table>");

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Example image

2. The trapezoid multiplication table with degrees in the lower right corner:

For loop code

document.write("<table width='' border='>");
for(var i=; i<=; i++){
document.write("<tr>");
for(var n=i; n<; n++){
document.write("<td> </td>");
}
for(var j=i; j>=; j--){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
}
document.write("</tr>");
}
document.write("</table>");

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While loop code

document.write("<table width='' border='>");
var i = ;
while(i<=){
document.write("<tr>");
var n = i;
while(n<){
document.write("<td> </td>");
n++;
}
var j = i;
while(j>=){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
j--;
}
document.write("</tr>");
i++;
}
document.write("</table>");

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Example image

3. Trapezoidal multiplication table with the upper left corner in degrees:

For loop code

document.write("<table width='' border='>");
for(var i=; i>=; i--){
document.write("<tr>");
for(var j=; j<=i; j++){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
}
document.write("</tr>");
}
document.write("</table>");

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While loop code

document.write("<table width='' border='>");
var i = ;
while(i>=){
document.write("<tr>");
var j = ;
while(j<=i){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
j++;
}
document.write("</tr>");
i--;
}
document.write("</table>");

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Example image

4. Trapezoidal multiplication table with the upper right corner in degrees:

For loop code

document.write("<table width='' border='>");
for(var i=; i>=; i--){
document.write("<tr>");
for(var j=; j>=i; j--){
document.write("<td> </td>");
}
for(var j=i; j>=; j--){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
}
document.write("</tr>");
}
document.write("</table>");

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While loop code

document.write("<table width='' border='>");
var i = ;
while(i>=){
document.write("<tr>");
var j = ;
while(j>=i){
document.write("<td> </td>");
j--;
}
var j = i;
while(j>=){
document.write("<td>"+ j +"*"+ i +"="+ i*j +"</td>");
j--;
}
document.write("</tr>");
i--;
}
document.write("</table>");

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Example image

The above content is the two commonly used loops (For, While) in JavaScript shared in this article to complete these four symmetrical multiplication tables. I hope it will be helpful to everyone!