数学随机查找数组中的名称，而无需重复 [英] Math random to find Names in an Array while not duplicating

问题描述

所以我想从一个名称数组中找到三个名称，然后将它们写到一个新的数组中（虽然到目前为止还没有得到），但是我遇到的问题是它一直在随机化我已经使用的相同名称找到。

查看 jsfiddle脚本。 / p>

代码：

  findStudentBtn.onclick = findStudent; 
 
函数findStudent（）{
 var studArray = [ John， Daniel， Hans， Lars， Tom， Amanda， Jane， Sarah] // 1-8 
 for（i = 0; i< 3; i ++）{
 if（i = 1）{
 var randomStud1 = studArray [Math.floor（studArray） .length * Math.random（））]; 
 msg8.innerHTML + = randomStud1 +，; 
} 
 if（i = 2）{
 var randomStud2 = studArray [Math.floor（studArray.length * Math.random（））]; 
 msg8.innerHTML + = randomStud2 +，; 
} 
 if（i = 3）{
 var randomStud3 = studArray [Math.floor（studArray.length * Math.random（））]; 
 msg8.innerHTML + = randomStud3 +，; 
} 
 
 if（randomStud1 == randomStud2 || randomStud2 == randomStud3 || randomStud1 == randomStud3）{
 ms8.innerHTML =; 
 findStudent（）; 
} 
} 
} 
  

解决方案

对于对解决方案感兴趣但不愿意使用jsfidle的人，这是我使用的脚本。

  findStudentBtn.onclick = function（）{
 findStudent（）; 
}; 
 
 var r_stud = [ John， Daniel， Hans， Lars， Tom， Amanda， Jane， Sarah]； 
 var r_rndm = []; 
 var r_newr = []; 
 
函数getStudent（）{
 
 //如果可用人数很少，则可以达到3。
 if（r_rndm.length == r_stud。 length）{
 //重置随机选择的数组
 r_rndm = []; 
 return r_newr; 
} 
 
 //选择一个学生
 var i_randomStudent = Math.floor（r_stud.length * Math.random（））; 
 var s_randomStudent = r_stud [i_randomStudent]; 
 
 if（r_rndm.indexOf（s_randomStudent）> = 0）{
 //如果已全部选择，请重试。 
 getStudent（）; 
} else {
 //将学生添加到新选择和所有选择中
 r_rndm.push（s_randomStudent）; 
 r_newr.push（s_randomStudent）; 
 
 //返回新数组
 return r_newr; 
} 
 
}; 
 
函数findStudent（）{
 
 //重置新数组。 
 r_newr = []; 
 for（i = 0; i< 3; i ++）{
 getStudent（）; 
}; 
 
 //将新数组的内容打印到控制台。 
 console.log（r_newr）; 
 
 for（i = 0; i< r_newr.length; i ++）{
分隔符=（i == r_newr.length-1&& r_rndm.length == 0） ？ ’’：‘，’； 
 msg8.innerHTML + = r_newr [i] +分隔符； 
} 
 
}; 
  

So I want to find three names out of an array of names which I then want to write to a new array (not gotten this far yet though), but the problem I have is that it keeps randomizing the same names I already found.

Check out the jsfiddle script.

Code:

findStudentBtn.onclick = findStudent;

function findStudent() {
    var studArray = ["John","Daniel","Hans","Lars","Tom","Amanda","Jane","Sarah"] //1-8
    for (i=0; i<3; i++) {
        if (i=1) {
            var randomStud1 = studArray[Math.floor(studArray.length * Math.random())];
            msg8.innerHTML += randomStud1 + ", ";
        }
        if (i=2) {
            var randomStud2 = studArray[Math.floor(studArray.length * Math.random())];
            msg8.innerHTML += randomStud2 + ", ";
        }
        if (i=3) {
            var randomStud3 = studArray[Math.floor(studArray.length * Math.random())];
            msg8.innerHTML += randomStud3 + ", ";
        }

        if (randomStud1 == randomStud2 || randomStud2 == randomStud3 || randomStud1 == randomStud3){
            ms8.innerHTML = "";
            findStudent();
        } 
    }
}  

解决方案

For anyone interested in the solution, but not willing to go to the jsfidle, here's is the script I used.

findStudentBtn.onclick = function(){
    findStudent();
};

var r_stud = ["John","Daniel","Hans","Lars","Tom","Amanda","Jane","Sarah"];
var r_rndm = [];
var r_newr = [];

function getStudent(){

    //if the amount of available people, is to small to reach 3.
    if(r_rndm.length == r_stud.length){
        //reset the random selected array
        r_rndm = [];
        return r_newr;
    }

    //select a student
    var i_randomStudent = Math.floor(r_stud.length * Math.random());
    var s_randomStudent = r_stud[i_randomStudent];

    if(r_rndm.indexOf(s_randomStudent) >= 0){
        //if it's allready been selected, try again.
        getStudent();
    }else{
        //add students to new selection and to alltime selection
        r_rndm.push(s_randomStudent);
        r_newr.push(s_randomStudent);

        //return the new array
        return r_newr;
    }

};

function findStudent(){

    //reset new array.
    r_newr = [];
    for(i = 0; i < 3; i++){
        getStudent();
    };

    //print contents of new array to console.
    console.log(r_newr);

    for(i = 0; i < r_newr.length; i++){
        separator = (i == r_newr.length - 1 && r_rndm.length == 0 ) ? '' : ', ';
        msg8.innerHTML += r_newr[i] + separator;
    }

};

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