鉴于此脚本:
<script type="text/javascript">
var noproblem07 = parseInt("07") - 1;
alert("No problem (07): " + noproblem07);
var problem08 = parseInt("08") - 1;
alert("Problem (08): " + problem08);
var problem09 = parseInt("09") - 1;
alert("Problem (09): " + problem09);
var noproblem10 = parseInt("10") - 1;
alert("No problem (10): " + noproblem10);
</script>
为什么“08”和“09”解析为-1?