javascript - while 循环。无法对 while 语句进行硬编码

Question

function start() {
    var output = "";
    var index = 0;
    var total = 0;
    var average = 0;
    var arr = []
while(arr.length < 12){
    var randomnumber = Math.ceil(Math.random()*20)
    if(arr.indexOf(randomnumber) > -1) continue;
    arr[arr.length] = randomnumber;
}

    output = output + "List of all values in the array: " + arr;
    output = output + "<br/>" + "Total number of values in the array: " + arr.length + "<br/>";

while(index < arr.length) {
    total = total + arr[index];
    index++;
    }
    average = total / index;
    output = output + "Total of all values: " + total + "<br/>";
    output = output + "Average of all values: " + average;

document.getElementById("msg").innerHTML = output;
}

有人告诉我不允许对语句进行硬编码，如何更改“while”语句以便不进行硬编码？

Answer 1

可能他们的意思是

var arr =  new Array(12);
var randIndex=0;

    while(randIndex < arr.length){
        var randomnumber = Math.ceil(Math.random()*20)
        if(arr.indexOf(randomnumber) > -1) continue;
        arr[randIndex] = randomnumber;
        randIndex++;
    }