Question

我必须创建一个程序，您输入一个数字1-100，它输出与您的分数对应的字母等级，我无法显示提示。这是一些代码：

function myGrade() {
  var Input = prompt("Input grade here:");
  if (Input >= 90) {
    document.write("The score you entered is "
      Input ". Your letter grade is A.");
  } else if (Input >= 80 && Input < 90) {
    document.write("The score you entered is "
      Input ". Your letter grade is B.");
  } else if (Input >= 70 && Input < 80) {
    document.write("The score you entered is "
      Input ". Your letter grade is C.");
  } else if (Input >= 60 && Input < 70) {
    document.write("The score you entered is "
      Input ". Your letter grade is D.");
  } else if (Input < 60) {
    document.write("The score you entered is "
      Input ". Your letter grade is F.");
  }
}

我在这段代码上面使用<body onload = "myGrade()">。

Answer 1

您需要先安装提示：

npm install prompt

所以解决方案比你的解决方案有点复杂：

var prompt = require('prompt');

prompt.start();

prompt.get(['grade'], function (err, Input) {
      if (err) { return onErr(err); }
      if (Input.grade >= 90) {
          console.log("The score you entered is " +
            Input.grade  + ". Your letter grade is A.");
      } else if (Input.grade >= 80 && Input.grade < 90) {
          console.log("The score you entered is "
            + Input.grade + ". Your letter grade is B.");
      } else if (Input.grade >= 70 && Input.grade < 80) {
          console.log("The score you entered is "
           + Input.grade + ". Your letter grade is C.");
      } else if (Input.grade >= 60 && Input.grade < 70) {
          console.log("The score you entered is "
          +  Input.grade + ". Your letter grade is D.");
      } else if (Input.grade < 60) {
          console.log("The score you entered is "
           + Input.grade + ". Your letter grade is F.");
      }
});

function onErr(err) {
    console.log(err);
    return 1;
}

您可以使用以下命令运行脚本：

node script.js

More information

Answer 2

这样做：将此代码复制到一个文件中，然后使用浏览器加载该文件。

<!DOCTYPE html>
<html class="">

<head>
<script type = "text/javascript" >
  function myGrade() {    
    var Input = prompt("Input grade here:",50);
    if (Input >= 90) {
      document.write("The score you entered is "
       + Input  + ". Your letter grade is A.");
        } else if (Input >= 80 && Input < 90) {
      document.write("The score you entered is "
       + Input  + ". Your letter grade is B.");
    } else if (Input >= 70 && Input < 80) {
      document.write("The score you entered is "
      + Input  + ". Your letter grade is C.");
    } else if (Input >= 60 && Input < 70) {
      document.write("The score you entered is "
        + Input  + ". Your letter grade is D.");
    } else if (Input < 60) {
      document.write("The score you entered is "
        + Input  + ". Your letter grade is F.");
    }

  } </script>
</head>
<body onload = "myGrade()"> 
<br>
</body>
</html>

HTML提示符（）将不会显示

2 个答案: