回文数
设n是一任意自然数。若将n的各位数字反向排列所得自然数n1与n相等,则称n为一回文数。
//回文数
let readline = require("readline-sync");
console.log("请输入数字:");
let num = parseInt(readline.question(""));
let newNum = 0;
for(temp=num;temp!=0;temp=parseInt(temp/10)){
newNum = newNum*10+temp%10;
}
newNum===num?console.log("是回文数"):console.log("不是回文数");

来源:https://www.cnblogs.com/CccK-html/p/11381018.html