JS Conv String To Binary SRC

<script>
var str=prompt("Enter Value:");
var fin=convertToBin(str);
alert(fin)
function convertToBin(str) {
var result = '';
var currentChar = '';
var i = 0;
for (; i < str.length; i += 1) {
currentChar = str[i].charCodeAt(0).toString(2);
if (currentChar.length < 8) {
while (8 - currentChar.length) {
currentChar = '0' + currentChar;
}
}
result += currentChar;
}
return result;
}
</script>