<script language=”JavaScript”>
function get_num(){
var num=Math.round(Math.random()*25); //生成0-20的随机数
if(num>20){
return 20;
}else{
return num;
}
}
//get_num();
var numarr=new Array();
for(i=30;i<=50;i++){
numarr.push(i);
}
arr_num=get_num();
document.write(numarr[arr_num]);
</script>
···
···