要在JavaScript中反转字符串，请尝试运行以下代码，该代码将反转字符串“qries”
<!DOCTYPE html>
<html>
<body>
<script>
var myStr;
function reverseStr(myStr) {
if(!myStr.trim() || 'string' !== typeof myStr) {
return;
}
let l=myStr.length, s='';
while(l > 0) {
l--;
s+= myStr[l];
}
return s;
}
document.write("Reversed String: " +reverseStr("qries"));
</script>
</body>
</html>