1 整数与IP地址间的转换

function iptoNumber(ip){
    let A=ip.split('.').map(v=>Number(v));
    let num='';
    for(let value of A){
       let k=value.toString(2);//将每个数字转为二进制串
        if(k.length<8){
            for(let i=k.length;i<8;i++){
                k='0'+k;
            }//循环结束后得到长度为8的二进制串k
        }
        num+=k;
    }
    return parseInt(num,2);//将字符串num转为整数，数字的基数为2
}

function numbertoIp(number){
    let str=Number(number).toString(2);
    for(let j=str.length; j<32 ;j++){
        str = '0' + str;
    }
    let first=parseInt(str.slice(0,8),2);
    let second=parseInt(str.slice(8,16),2);
    let third=parseInt(str.slice(16,24),2);
    let forth=parseInt(str.slice(24,32),2);
    return first+'.'+second+'.'+third+'.'+forth;
}


while(ip=readline(),num=readline()){
   console.log(iptoNumber(ip));
   console.log(numbertoIp(num)); 
}

2 蛇形矩阵

while(n = readline()) {
var num = Number(n);
        var start = 1;//每行的初始值
        for (let i = 1; i <=num; i++) {//行数
            var flag = start;//flag记录每行的初始值
            let tep = i + 1;
            let str = start + ' ';
            for (let j = num - i; j > 0; j--) {//列数
                let next = start + tep;
                str += next + ' ';
                tep++;
                start = next;

            }//循环结束得到一行的值
            start = flag + i;//每行的初始值
            console.log(str);//这里自带换行
        }
}