Question

我正在尝试制作一个简单的计算器，但它不起作用，有人能告诉我问题出在哪里。谢谢！

path("upload"){
  (post & extractRequestContext) { ctx => {
    implicit val materializer = ctx.materializer
    implicit val ec = ctx.executionContext
    fileUpload("fileUploads") {
      case (fileInfo, fileStream) =>
        val path = "E:\\"
        val sink = FileIO.toPath(Paths.get(path).resolve(fileInfo.fileName))
        val wResult = fileStream.runWith(sink)
        onSuccess(wResult) { rep => rep.status match {
          case Success(_) => 
            var ePath = path + File.separator + fileInfo.fileName 
            readFile(ePath)
            _success message_
          case Failure(e) => _faillure message_
        } }
    }
  } }
}

Answer 1

多件事

首先，如果您想获取输入值，您可以访问输入的value属性

document.getElementById('id').value

第二个，如果您想设置输入value，请不要使用innerHTML。它只在您想要更新HTML元素的内容时才有用。

function sumNumbers() {
    let num1 = document.getElementById('num1').value;
    let num2 = document.getElementById('num2').value;
    let sum = Number(num1) + Number(num2);
    document.getElementById('result').value = sum;
}

<form>
<div>First Number:</div>

<div>  <input type="number" id="num1" /></div>

<div>Second Number:</div>

<div>   <input type="number" id="num2" /></div>

<div><input type="button" value="Calculate Sum" onclick="sumNumbers()"/></div>
<div>Result:</div>
<div> <input type="number" id="result" /></div>

</form>

Answer 2

您没有从输入中提取值，使用

let num1 = document.getElementById('num1').value

同样适用于settig值，即

document.getElementById('result').value = sum

＆＃13;

<form>
  <div>First Number:</div>

  <div> <input type="number" id="num1" /></div>

  <div>Second Number:</div>

  <div> <input type="number" id="num2" /></div>

  <div><input type="button" value="Calculate Sum" onclick="sumNumbers()" /></div>
  <div>Result:</div>
  <div> <input type="number" id="result" /></div>

</form>

<script>
  function sumNumbers() {
    let num1 = document.getElementById('num1').value;
    let num2 = document.getElementById('num2').value;
    let sum = Number(num1) + Number(num2);
    document.getElementById('result').value = sum;
  }
</script>

＆＃13;

js简单的计算器输出错误

2 个答案: