Sop 3 javascript. Count vowels
<!DOCTYPE html>
<html><head><title>count vowels</title>
<script type="text/javascript">
function cnt()
{ var str, count, i, len;
str=(f1.str1.value);
count=0;
len=str.length; for(i=0;i<=len;i++)
{ if((str[i] == "a")||(str[i] == "A")) {
count=count+1;
} else if((str[i] == "e")||(str[i] == "E"))
{
count=count+1;
} else if((str[i] == "i" )||(str[i] == "1")) {
count=count+1;
} else if((str[i] == "o")||(str[i] == "O" ))
{ count=count+1;
} else if((str[i] == "u" )||(str[i] == "U" )) {
count=count+1;
}
} alert("Number of vowels are:=====> "+count);
}
</script>
</head>
<body>
<form name="f1">
Enter any string: <input type="text" name="str1"><br>
<input type="button" value="Count Vowels" onClick="cnt()">
</form>
</body>
</html>
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