Code

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To copy code: Click   “View Source” on the right of this code snippet.

<script>

{

var lines,i,j,k,temp;

var lines = prompt("Please enter the number of lines you want to print");

temp=lines;

for(i=1;i<=lines;i++)

{

for(j=1;j<=temp;j++)

{

document.write(i);

}

temp=temp-1;

document.write("<br/>");

}

}

</script>

Background and Explanation of the code

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1. A JavaScript prompt box has been used to input the number of lines up to which the pattern will be printed.
2. Two nested ‘for’ loops have been used to print the desired pattern. Variable ‘temp’ has been used for temporary storage.