javascript带范围的随机整数生成

Posted 2020-10-30

//生成一个整数随机数，并且范围为[min,max)
function randomInt(min,max){
    if(min < 0 || max <0){
        throw "不支持负数";
    }
    
    var number = parseInt(Math.random().toString().substring(2));
    return number%(max-min) + min;
}

//生成count个不重复的随机数，并且范围为[scope_min,scope_max)
function randomIntNoRepeat(count,scope_min,scope_max){
    var numbers = [];
    if(scope_max - scope_min < count){//范围不正确
        throw "范围不正确";
    }
    for(var i = 0; i < count;i ++){
        var number = randomInt(scope_min,scope_max);
        while(numbers.includes(number)){
            number = randomInt(scope_min,scope_max);
        }
        numbers.push(number);
    }
    return numbers;
}