Question

我得到以下代码的输出为n = 3，x = 6 但我需要输出

n = 1, x = 1
n = 2, x = 3
n = 3, x = 6

有人可以帮助我在代码中添加其他内容吗？

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>

    function myFunction() {
        var n = 0;
        var x = 0;
        while (n < 3) {
            n++;
            x += n;
        }
        document.getElementById("demo").innerHTML = "n = " + n + ", " + "x = " + x;
    }

</script>

</body>
</html>

@Jai下面的例子类似，

function myFunction() {
    var text = "";
    var i = 0;
    while (i < 10) {
        text += "<br>The number is " + i;
        i++;
    }
    document.getElementById("demo").innerHTML = text;
}

输出

The number is 0  
 The number is 1
  ...

Answer 1

function myFunction() {
    var n = 0;
    var x = 0;
    while (n < 3) {
        n++;
        x += n;

    document.getElementById("demo").innerHTML += 
    "n = " + n + ", " + "x = " + x;
    }

}

你必须＆＃34;添加＆＃34;内部html。所以，把＆＃34; + =＆＃34;并在循环内。

Answer 2

连接innerHTML并将其置于循环中：

document.getElementById("demo").innerHTML += 
"n = " + n + ", " + "x = " + x;

} // <---end of while

Answer 3

您的代码执行while循环3次，每次更新n和x的值。但是因为您在while循环之外写入输出，所以只能看到最后的值。您需要在while循环中放置一行显示变量。

Javascript While循环中不需要的输出

3 个答案: