JavaScript 在我的任何浏览器中都不工作

Question

我只是在学习 JavaScript，出于某种原因，这个简单（来自 Chapter One) example is not working (Jon Duckett's JavaScript and Jquery book) in any of my browsers: FireFox, IE, and Chrome. I made sure JavaScript is turned on. I also put noscript tags in my index.html file to make sure I had JavaScript on. My jsFiddle works perfectly, but nothing in my browsers. Here is my jsFiddle 的示例 1 以及我在 Atom 编辑器中拥有的所有内容。我的链接是正确的，因为我复制了完整路径，然后将它粘贴到 src 中。然后我删除了所有 C:\users....... 直到我进入包含所有文件的文件夹以结束 jsFiddle 中的内容。

html:

<!doctype html>
<html lang="en">
<head>
<meta charset="etf-8" />
<title>Greeting JavaScript</title>
<link rel="stylesheet" href="css/styles.css">
<script src="scripts/greeting.js"></script>
</head>
<body>
<noscript>Your Browser Does Not Support JavaScript.  Please Enable It.</noscript>
<section>
<div id="header">
  <h1>Constructive & Co.</h1>
</div>
<h3 id="greeting"></h3>
<p>For all orders and inquiries please call <em>555-3344</em></p>
</section>
</body>
</html>

javascript:

var today = new Date();
var hourNow = today.getHours();
var greeting;

if (hourNow > 18) {
 greeting = 'Good evening!';
} else if (hourNow > 12) {
 greeting = 'Good afternoon!';
} else if (hourNow > 0) {
 greeting = 'Good morning!';
} else {
 greeting = 'Welcome!';
}

document.getElementById("greeting").innerHTML = greeting;

CSS:

@import url(http://fonts.googleapis.com/css?family=Open+Sans:800italic);

body {
font-family: "Courier New", Courier, monospace;
/*background: url("../images/constructive-backdrop.jpg") no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;*/
background: #a18957;
margin: 0px;
padding: 0px;
text-align: center;
}
section {
margin-top: 20px;
margin-left: 20px;
height: 500px;
width: 400px;
background: #eee;
border: 1px solid #292929;
}
#header {
height: 200px;
margin: 10px;
background: rgba(227, 192, 186, 0.78);
}
h1 {
margin: 0px;
position: relative;
top: 45%;
}
h3 {
height: 100px;
margin: 10px;
background: red;
}
p {
margin: 10px;
height: 100px;
}

谢谢

Answer 1

您想在 html 的末尾添加 script 标签。元素 greeting 在您执行时不存在。

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>Greeting JavaScript</title>
  <link rel="stylesheet" href="css/styles.css">
</head>
<body>
  <noscript>Your Browser Does Not Support JavaScript.  Please Enable It.</noscript>
  <section>
    <div id="header">
      <h1>Constructive &amp; Co.</h1>
    </div>
    <h3 id="greeting"></h3>
    <p>For all orders and inquiries please call <em>555-3344</em></p>
  </section>
  <script src="scripts/greeting.js"></script>
</body>
</html>

或者你把它留在头部然后将脚本包装成

addEventListener("readystatechange", function () {
  if (document.readyState === "interactive") {

    var today = new Date();
    var hourNow = today.getHours();
    var greeting;

    if (hourNow > 18) {
      greeting = 'Good evening!';
    } else if (hourNow > 12) {
      greeting = 'Good afternoon!';
    } else if (hourNow > 0) {
      greeting = 'Good morning!';
    } else {
      greeting = 'Welcome!';
    }

    document.getElementById("greeting").innerHTML = greeting;

  }
}, false);

很高兴你使用 document.getElementById，而不是 document.write！

JavaScript 在我的任何浏览器中都不工作

JavaScript is Not Working in any of my Browsers

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