<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Array Test</h2>
<p id="demo"></p>
<br>
<script>
var arr = [1,2,3,4,5,"5","12","8"];
var total=0;
console.log("จำนวน "+arr.length);
for(var i in arr)
{
console.log(arr[i]);
console.log(typeof arr[i]);
arr = arr.map(Number);
total += arr[i];
}
console.log("Sum = "+total);
</script>
</body>
</html>
