随机数

规则：随机出四位数，且四位数的值不相等且里面不包含0这个数字

方法一

const re = require('readline-sync');
let max = 9,min = 1;
let temp = [] ;//随机数
for(let i=0;i<4;i++){temp[i] = parseInt(Math.random()*(max-min+1)+min);  for(let j=0;j<i;j++){while(temp[i]==temp[j]){j=0;temp[i] = parseInt(Math.random()*(max-min+1)+min);}}   
}

方法二

const re = require('readline-sync');
let max = 9,min = 1;
let temp = [] ;//随机数
let first,last;  //查重，first为前往后查找，last为从后往前找
for(let i=0;i<10;i++){  let str = parseInt(Math.random()*(max-min+1)+min); //装随机数的字符串temp.push(str);   //temp为存放的四位随机数for(let i=0;i<temp.length;){// console.log(arr[i]);first = temp.indexOf(temp[i]);// console.log(temp);last = temp.lastIndexOf(temp[i]);// console.log(index);if(first != last){temp.splice(last,1); }else{i++;}        }str = '';if(temp.length==4){ //判断数组长度为四则跳出break;   }    
}

方法三

let state = true;  //定义一个循环控制
let bb = [], aa = []; //aa为把随机数转换成字符串，bb为把字符串转换成数组
while (state) { let str = Math.floor(Math.random() * (max - min + 1) + min);aa = str.toString();bb = aa.split("");console.log(bb);for (let i = 0; i < 4;) {first = bb.indexOf(bb[i]);console.log(first);last = bb.lastIndexOf(bb[i]);console.log(last);if (first == last && bb[i] != 0) {  //当满足每个值不相等且都不为0的时候查重完跳出。i++;} else {break;}console.log(bb);if (i > 3) {  //判断是否查重完state = false;break;}}str = "";
}
console.log(`输出${bb}`);