[英]Trying to load random images using jquery — Not working
我是javascript和jquery的新手。 我想在加載頁面時加載隨機圖像。 我發現了一些看起來很簡單的代碼,但似乎無法使其正常工作,而且我不知道自己在做什么錯。 一切對我來說都很好。
我的HTML如下:
<html xmlns="http://www.23.org/19999/xhtml">
<head>
<title>A Site Just For Me!</title>
<script type="text/javascript" src="jquery.min.js"></script>
<link href='http://fonts.googleapis.com/css?family=Economica:400,700|Francois+One' rel='stylesheet' type='text/css'>
<script type="text/javascript" src="myjs.js"></script>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">
<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap-theme.min.css">
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css" href="me_css.css">
</head>
<body >
<div class="jumbotron">
<div class="container">
<div class="greeting"></div>
<div id="happypic"></div>
<div id="banner"></div>
<div id="banner2"></div>
</div>
</div>
</body>
</html>
這是我的JavaScript文件:
// A $( document ).ready() block.
$( document ).ready(function() {
});
//This is where i set up my greeting.
var nowDate=new Date();
var nowHour=nowDate.getHours();
var greeting;
if (nowHour<11)
{
//good morning
greeting="Good morning";
}
else if (nowHour<16)
{
//good afternoon
greeting="Good afternoon";
}
else
{
//good evening
greeting="Good evening";
}
//document.write("<center><h1>"+greeting+", Loser!");//
// This is where i put my random picture chooser
// pictures
//random image experiment
var hawaiiPix=new Array("hawaii1.jpg", "hawaii2.jpg", "hawaii3.jpg", "hawaii4.jpg", "hawaii5.jpg");
$('<img src="img/'+hawaiiPix[Math.floor(Math.random()*hawaiiPix.length)]+'">"').appendTo('#happypic');
var images = ["hawaii1.jpg", "hawaii2.jpg", "hawaii3.jpg", "hawaii4.jpg", "hawaii5.jpg"];
$('<img src="images/' + images[Math.floor(Math.random() * images.length)] + '">').appendTo('#banner');
$('<h1>Hello</h1>').appendTo('#banner2');
任何見解將不勝感激...
問題是您的jQuery代碼在ready函數之外,因此它在DOM加載之前就已在運行,因此它無法添加圖像,因為這些元素在HTML頁面中尚不存在。
一種方法是將myjs.js
文件的加載放在</body>
之前,以便在其執行時加載項目(您需要刪除jQuery.ready代碼),或者可以將其放入ready塊中,如下所示:
$( document ).ready(function() {
//This is where i set up my greeting.
var nowDate=new Date();
var nowHour=nowDate.getHours();
var greeting;
if (nowHour<11)
{
//good morning
greeting="Good morning";
}
else if (nowHour<16)
{
//good afternoon
greeting="Good afternoon";
}
else
{
//good evening
greeting="Good evening";
}
//document.write("<center><h1>"+greeting+", Loser!");//
// This is where i put my random picture chooser
// pictures
//random image experiment
var hawaiiPix=new Array("hawaii1.jpg", "hawaii2.jpg", "hawaii3.jpg", "hawaii4.jpg", "hawaii5.jpg");
$('<img src="img/'+hawaiiPix[Math.floor(Math.random()*hawaiiPix.length)]+'">"').appendTo('#happypic');
var images = ["hawaii1.jpg", "hawaii2.jpg", "hawaii3.jpg", "hawaii4.jpg", "hawaii5.jpg"];
$('<img src="images/' + images[Math.floor(Math.random() * images.length)] + '">').appendTo('#banner');
$('<h1>Hello</h1>').appendTo('#banner2');
});
最好的方法是將jQuery和JS文件的加載移到html代碼的底部。
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