在 JavaScript 中格式化 document.write() 的输出

Question

我创建了一个简单的计算器，它会根据您在 class 中获得的分数告诉您您获得的字母等级。然而，我想要做的是格式化 document.write() 的文本。我不想简单地打印文本，而是希望它打印出具有特定大小字体的文本，网页中的特定背景颜色（就在 document.write() 的输出周围），我还想在生成的输出下划线.

<html>
 <head><title>Letter-Grade Calculator</title></head>
 <body>
 <h3>Letter-Grade Calculator</h3>
  <script type="text/javascript">

     var score = parseFloat(prompt ("What is your score?"));

     if (score >= 90){
         document.write("The score you entered is: " + score + ". Your letter grade is: A!");
 }
     else if (score >= 80 && score <= 89.9){
         document.write("The score you entered is: " + score + ". Your letter grade is: B!");
 }
     else if (score >= 70 && score <= 79.9){
         document.write("The score you entered is: " + score + ". Your letter grade is: C!");
 }
     else if (score >= 60 && score <= 69.9){
         document.write("The score you entered is: " + score + ". Your letter grade is: D!");
 }
     else {
         document.write("The score you entered is: " + score + ". Your letter grade is: F!");
 }

  </script>
 </body>
</html>

我厌倦了将每个 document.write() 中的文本分配给特定变量，然后在 document.write() 中调用该变量（例如：假设我有一个变量 'gradeA' 然后将第一个 if 条件设置为 return 'document.write(gradeA);' if true) 然后使用我在网上找到的某些扩展来尝试修改变量。但是我无法让它输出我需要的东西。

Answer 1

使用css和标签...

<html>
 <head><title>Letter-Grade Calculator</title></head>
 <body>
 <h3>Letter-Grade Calculator</h3>
 <style>
    .red {background: red;};
    .blue {background: blue;};
    .green {background: green;};
    .yellow {background: yellow;};
    .black {background: black;};
 </style>
  <script type="text/javascript">

     var score = parseFloat(prompt ("What is your score?"));

     if (score >= 90){
         document.write("<span class='red'>The score you entered is: " + score + ". Your letter grade is: A!</span>");
 }
     else if (score >= 80 && score <= 89.9){
         document.write("<span class='green'>The score you entered is: " + score + ". Your letter grade is: B!</span>");
 }
     else if (score >= 70 && score <= 79.9){
         document.write("<span class='blue'>The score you entered is: " + score + ". Your letter grade is: C!</span>");
 }
     else if (score >= 60 && score <= 69.9){
         document.write("<span class='yellow'>The score you entered is: " + score + ". Your letter grade is: D!</span>");
 }
     else {
         document.write("<span class='black'>The score you entered is: " + score + ". Your letter grade is: F!</span>");
 }

  </script>
 </body>
</html>

Answer 2

如果您真的想要使用document.write()，您将需要创建具有style或class属性的元素。我不推荐这个，因为它不可扩展而且风格非常糟糕。

document.write("<div style='font-family:Arial''>hello</div>");

将写入文档 div 其字体为 Arial.

更好的方法是在 HTML 中使用 <style>，使用 JavaScript 创建 <div> 元素，设置其属性，然后将其附加到文档中。

CSS

div.formatted{
    font-family: Arial;
}

JS

var myDiv = document.createElement("div");
myDiv.innerHTML = "Hello";
myDiv.className = "formatted";
document.body.appendChild(myDiv);

Answer 3

使用 dev 元素显示结果这里是示例代码：

<html>
 <head><title>Letter-Grade Calculator</title></head>
 <body>
 <h3>Letter-Grade Calculator</h3>
 <div id="result"><div>
<script type="text/javascript">
    var score = parseFloat(prompt ("What is your score?"));
     if (score >= 90){
         document.getElementById('result').innerHTML = "The score you entered s: " + score + ". Your letter grade is: A!";
 }
     else if (score >= 80 && score <= 89.9){
         document.getElementById('result').innerHTML = "The score you entered is: " + score + ". Your letter grade is: B!";
 }
     else if (score >= 70 && score <= 79.9){
         document.getElementById('result').innerHTML = "The score you entered is: " + score + ". Your letter grade is: C!";
 }
     else if (score >= 60 && score <= 69.9){
         document.getElementById('result').innerHTML = "The score you entered is: " + score + ". Your letter grade is: D!";
 }
     else {
         document.getElementById('result').innerHTML = "The score you entered is: " + score + ". Your letter grade is: F!";
 }
</script>
 </body>
</html>

您可以应用您选择的样式等...

在 JavaScript 中格式化 document.write() 的输出

Formatting the output of document.write() in JavaScript

javascript

document.write