如何在一周中的几天之间更改照片

到目前为止，我有很多代码，但我无法让 load（）函数工作：

<!DOCTYPE html>
<html lang="en">
<head>
<!-- Page resizer -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
<!-- Date -->
<script>
var d = new Date();
var days = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
document.getElementById("date").innerHTML = days[d.getDay()];
</script>
<!-- Gif changer -->
<script>
function changegif() {
  var gif;
  if (days = Sunday) {
    gif = "/img/sunday.gif";
  } else if (days = Monday) {
    gif = "/img/monday.gif";
  } else if (days = Tuesday) {
    gif = "/img/tuesday.gif";
  } else if (days = Wednesday) {
    gif = "/img/wednesday.gif";
  } else if (days = Thursday) {
    gif = "/img/thursday.gif";
  } else if (days = Friday) {
    gif = "/img/friday.gif";
  } else if (days = Saturday) {
    gif = "/img/saturday.gif";
  }
}
function load() {
  document.getElementById('gif').src = changegif();
}
</script>
</head>
<body onload="load()">
<!-- More date stuff -->
<style>
.image { 
   position: relative; 
   width: 100%; /* for IE 6 */
}
h2 { 
   position: absolute; 
   top: 150px; 
   left: 0; 
   width: 100%; 
}
h2 span { 
   color: white; 
   font: bold 24px/45px Helvetica, Sans-Serif; 
   letter-spacing: -1px;  
   background: rgb(0, 0, 0); /* fallback color */
   background: rgba(0, 0, 0, 0.7);
   padding: 10px; 
}
h1 { 
   position: absolute; 
   top: 200px; 
   left: 0; 
   width: 100%; 
}
h1 span { 
   color: white; 
   font: bold 24px/45px Helvetica, Sans-Serif; 
   letter-spacing: -1px;  
   background: rgb(0, 0, 0); /* fallback color */
   background: rgba(0, 0, 0, 0.7);
   padding: 10px; 
}
</style>
<div class="image">
<img src="#" id="gif">
<h2><span>Enjoy Your</span></h2>
<br>
<h1 id="date"><span></span></h1>
</div>
</body>
</html>

如果有人知道我做错了什么，请告诉我。我尝试将这些功能集成到按钮中，但仍然不起作用。

删除所有你自己的<script>，然后使用这个：

function load() {
    var day = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"][new Date().getDay()];
    document.getElementById("date").innerHTML = day;
    document.getElementById('gif').src = "/img/" + day.toLowerCase() + ".gif";
}

解释所有错误：

=分配;它不比较。
changegif 不会返回任何内容，因此document.getElementById('gif').src = changegif();始终将其设置为 undefined（假设没有其他错误）。
Sunday 和其他人是未声明的变量名;它们只能作为字符串工作："Sunday" 。
days不是一天，而是整个数组，因此将其与一天进行比较是行不通的。

changegif可以简化为：

function changegif(){
  return "/img/"
    + days[d.getDay()].toLowerCase()
    + ".gif";
}

或者使用克里斯·

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