Gampang. Pakai fungsi Number(). Misalnya gini nih:
<script>
var x = "21";
x = Number(x);
alert(x);
//Now, try to add x and something
x = x + 21;
alert(x);
</script>
<script>
var x = "21";
x = Number(x);
alert(x);
//Now, try to add x and something
x = x + 21;
alert(x);
</script>
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