JS achieves symmetric 9-9 multiplication tables up and down, and js symmetric between left and right

JS achieves symmetric 9-9 multiplication tables up and down, and js symmetric between left and right

Multiplication tables can be implemented in many languages. This article describes two common types of loops (For and While) in JavaScript to complete these four symmetric 9-9 multiplication tables. This example is a good way to practice loops, because the layout is not neat, a table is circulated.

1. trapezoid multiplication table of degree in the lower left corner:

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>"); 

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>");

Example

 

2. The lower right corner is the trapezoid multiplication table of degrees:

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>");

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>");

Example

3. trapezoid multiplication table of degree in the upper left corner:

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>");

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>");

Example

4. trapezoid multiplication table of degree in the upper right corner:

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>");

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>");

Example

The above content is the common two types of loops (For and While) in JavaScript used in this article to complete these four symmetric 9-9 multiplication tables. I hope this will help you!

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