SOURCE

const number =[];
for(i=0;i<5;i++){
    const num = Math.floor(Math.random()*5+19);
    if(number.indexOf(num)==-1){
        number.push(num)
    }else {
        i--;
    }
}
    console.log("随机生成5位数去重："+number)


function nui(arr){
    return Array.from(new Set(arr))
}
const num1=nui([1,1,2,2,3])
console.log("简单去重："+num1)