Question

我正在尝试计算和打印乘法表的结果。

表单接受Number以及乘法的起始和结束范围。

结果应以＆＃34; 12 x 1 = 12＆＃34;的格式打印。等等

除了最后一行之外，所有内容都有效，以便在＆＃39;内容＆＃39;中打印计算结果。格。

结果只是闪烁了一秒钟。没有错误

HTML

<form name="multiply">
    <p>Enter the number: <input type="number" id="myNum"></p>
    <p>From: <input type="number" id="sValue"> To: <input type="number" id="eValue"></p>
    <input type="submit" name="Calculate" onclick="timesTable()">
</form>

<div id="content"></div>

的Javascript

        function timesTable() {
        Num = document.getElementById("myNum").value;
        startValue = document.getElementById("sValue").value;
        endValue = document.getElementById("eValue").value;
        var result = [];

        for (var i = startValue; i <= endValue; i++) {

            result[i] = Num * i;

            document.getElementById("content").innerHTML = Num + " x " + i + " = " + result[i] + "<br>";
        }
        }

Answer 1

你需要在for循环之后插入DOM。

function timesTable() {
  total="";
        Num = document.getElementById("myNum").value;
        startValue = document.getElementById("sValue").value;
        endValue = document.getElementById("eValue").value;
        var result = [];

        for (var i = startValue; i <= endValue; i++) {

            result[i] = Num * i;

             total=total+" "+ Num + " x " + i + " = " + result[i] + "<br>";
        }
  document.getElementById("content").innerHTML=total;
        }

<form name="multiply" onsubmit="return false;">
    <p>Enter the number: <input type="number" id="myNum"></p>
    <p>From: <input type="number" id="sValue"> To: <input type="number" id="eValue"></p>
    <input type="submit" name="Calculate" onclick="timesTable()">
</form>

<div id="content"></div>

Answer 2

这是典型的关闭问题。它显示最后输入的值。

将您的代码更改为以下

function timesTable() {
  Num = document.getElementById("myNum").value;
  startValue = document.getElementById("sValue").value;
  endValue = document.getElementById("eValue").value;
  var result = [];
  var content = document.getElementById("content");
  var res=[];
  for (var i = startValue; i <= endValue; i++) {

    result[i] = Num * i;
    res.push( (function(i) {

      return Num + " x " + i + " = " + result[i] + "<br>"
    })(i));

  }
  content.innerHTML = res;
}

<form name="multiply">
  <p>Enter the number:
    <input type="number" id="myNum">
  </p>
  <p>From:
    <input type="number" id="sValue">To:
    <input type="number" id="eValue">
  </p>
  <input type="submit" name="Calculate" onclick="timesTable()">
</form>

<div id="content"></div>

希望这有帮助

根据表单输入打印乘法表 - 不打印结果

2 个答案: