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write a programme using while loop;

<html>

<head><title>javascript</title>

<script>

function loop(){

let n = 8; 

for (let i = 1; i <= n; i++) {

for (let j = 0; j < i; j++) {

document.write("*");
}

document.write("<br>");

}

}

document.getElementById("demo").innerHTML=loop();

</script>

</head>

<body>

<p id="demo"></p>

</body>

</html>

         

output:-

56

60

64

68

72

76

80

 Write a programme using do while loop;

<html>

<head><title>javascript</title>

<script>

function loop(){

let loop=2;

do{

document.write("hello"+"<br>")

loop=loop+2;

}

while(loop<=12);

}

document.getElementById("demo").innerHTML=loop();

</script>

</head>

<body>

<p id="demo"></p>

</body>

</html>

OUTPUT

hello

hello

hello

hello

hello

hello