函数不显示正确的结果

Question

我有一个我编写的因子查找器，它应该首先检查输入框中输入的值是 1 还是 0，以便它显示 "The factor of 1 is 1." 或 "The factor of 0 is 0."，但是当我在输入框中输入数字 0 时，它显示 "The factor of 0 is ." 但我不知道为什么。这可能是一个我无法弄清楚的简单错误。这是我的代码。 HTML:

<!DOCTYPE HTML>

<html lang="en">
    <head>
        <title>JavaScript</title>
        <script type="text/javascript" src="javaScript/prime.js"></script>
    </head>
    <body>
        <!--Number-->
        <h1>Factor finder</h1>
        <p>Enter a number to find the factors!</p>
        <form name="prime" id="here">
            Number:
            <input class ="enter2" type="text" name="primeinput" size ="20"/>
            <input type="button" name="addnumber" value="Go" onclick="findFactor();"/>
            <br />
            <h2>Results</h2>
        </form>
    </body>
</html>

JavaScript:

//counters
var numbernum = 0;
var numinput = 1;
//function
function findFactor(){
    var array = new Array();
    //get input
    thenumber=document.prime.primeinput.value;
    //special circumstances for 1 and 0
    if (thenumber == 1 || thenumber == 0){
        amount = "The factor of ";
        verb = " is ";
    } else{
        amount = "The factors of ";
        verb = " are ";
    }
    //factor finder
    for (i=1; i<thenumber + 1; i++){
        //check to see if the number is a factor
        if(thenumber % i == 0){
            //check if the number is 1 or 0 to state the factors are 1 or 0
            //not working with 0             
            if(thenumber == 1 || thenumber == 0){
                if (thenumber == 1){
                    array[0] = 1;
                } else if (thenumber == 0){
                    array[0] = 0;
                }
            //if the number isn't 0 or 1
            } else if(thenumber != 1 && thenumber != 0){
                if (thenumber == numinput){
                    array[numbernum] = "and " + numinput;
                } else{
                    array[numbernum] = numinput;
                    numbernum ++
            }

        }

    }
    numinput ++
}
//append to the HTML
var make = document.createElement("p");
var apply = document.createTextNode(amount + thenumber + verb + array.join(", ") + ".");
make.appendChild(apply);
document.getElementById("here").appendChild(make);
//reset counters and clear array
numbernum = 0;
numinput = 1;
var array = 0;
}

Answer 1

for 不循环是因为：

for (i=1; i < 0 + 1

尝试将其更改为

for (i=1; i <= thenumber

Answer 2

在 0 和 1 的特殊情况下，不要理会 for 循环，因为您知道正确的结果应该是什么。所以把 if 放在 for 外面：

if (thenumber < 2) {
    array[0] = thenumber;
} else {
    for (var i = 1; i <= thenumber; i++) {
        if (thenumber % i == 0) {
            array.push(i);
        }
    }
}

函数不显示正确的结果

Function not displaying correct results

html

javascript

arrays

primes

factors