<script type="text/javascript">
    var a=‘1000‘;
    a = parseInt(a);
    alert(a);
</script>

<script type="text/javascript">
        var a=confirm("打游戏吗");
    alert(a);
</script>

1 <script type="text/javascript">
2       var a=prompt("输入一个数");
3     var b=prompt("输入另一个数");
4     var sum=parseInt(a)+parseInt(b);
5     alert(sum);
6 </script>

1 <script type="text/javascript">
2        var a=100;
3     var b=12;
4     alert(a%b);
5 </script>