i在我的hint（）方法中有错误，对获取字符串的理解为空值

Question

var message = "";
var student;

function print(message) {
  var outputDiv = document.getElementById("output");
  outputDiv.innerHTML = message;
}

function getStudentReport(student) {
  let report = "<h2>Student: " + student.name + "</h2>";
  report += "<p>Track: " + student.track + "</p>";
  report += "<p>Points: " + student.points + "</p>";
  report += "<p>Achievements: " + student.achievements + "</p>";
  return report;
}

while (true) {
  var search = prompt('Search student record: type a name [Jody
] (or type "quit" to end)');
  if (search === null || search.toLowerCase() === "quit") {
    break;
  }
  for (var i = 0; i < students.length; i += 1) {
    student = students[i];
    if (student.name === search) {
      message = getStudentReport(student);
      print(message);
    }
  }
}

我遇到以下问题，到目前为止，我正在尝试通过prompt()收集用户信息，到目前为止，默认情况下prompt()始终会返回一个字符串，但是在这种情况下，它将返回null作为输出。

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Answer 1

只需删除换行符。请查看以下代码段。

var message = "";
var students = [{
  name: 'Jody',
  track: 2,
  points: 80,
  achievements: 'none'
}];

function print(message) {
  var outputDiv = document.getElementById("output");
  outputDiv.innerHTML = message;
}

function getStudentReport(student) {
  let report = "<h2>Student: " + student.name + "</h2>";
  report += "<p>Track: " + student.track + "</p>";
  report += "<p>Points: " + student.points + "</p>";
  report += "<p>Achievements: " + student.achievements + "</p>";
  return report;
}

while (true) {
  var search = prompt('Search student record: type a name [Jody] (or type "quit" to end)');

  if (search === null || search.toLowerCase() === "quit") {
    break;
  }
  for (var i = 0; i < students.length; i += 1) {
    student = students[i];
    if (student.name === search) {
      message = getStudentReport(student);
      print(message);
    }
  }
}

<div id="output"></div>

Answer 2

此两行：

var search = prompt('Search student record: type a name [Jody
 ] (or type "quit" to end)');

加入一行。

var search = prompt('Search student record: type a name [Jody] (or type "quit" to end)');

新行（换行符）中断了您的代码。

还可以在第一行的末尾使用插值``或\进行求解。