<script type="text/javascript">
var a = 12345;
// console.log(a);
var b = parseInt(a/10000);
console.log('万位='+b);
var c = parseInt((a%10000)/1000);
//12345%10000=2345 --->2345/1000=2.345 再取整
console.log('千位='+c);
var d = parseInt((a/100)%10);
//12345/100=123.45 --->123.45%10=3.45000000000003 再取整
console.log('百位='+d);
var e = parseInt((a%100)/10);
//12345%100=45 --->45/10=4.5 再取整
console.log('十位='+e);
var f = a%10;
console.log('个位='+f);
</script>