html javascript
我对javascript有问题。 我需要为页面中的所有img标记添加onclick监听器,所以单击图像应该调用imageClicked并将元素传递给函数。但此代码始终将img src=“../images/3.jpg”传递给函数html javascript,javascript,html,Javascript,Html,我对javascript有问题。 我需要为页面中的所有img标记添加onclick监听器,所以单击图像应该调用imageClicked并将元素传递给函数。但此代码始终将img src=“../images/3.jpg”传递给函数 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <htm
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="style.css" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Sample Page</title>
</head>
<body onload="start()">
<script type="text/javascript">
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
var image=images[i];
image.addEventListener('click', function(){
imageClicked(image);
});
}
}
function imageClicked(image){
alert(image.src)
}
</script>
<div id="main">
<div id="center">
<button>نمایش اسلایدی</button>
</div>
<div id="gallery">
<div id="img1" class="image">
<img src="../images/1.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img2" class="image">
<img src="../images/2.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img" class="image">
<img src="../images/3.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
</div>
</div>
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', function(){
imageClicked(this);
});
}
}
// Or even better
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', imageClicked);
}
}
function imageClicked(){
alert(this.src); // this refers to the image
}
样本页
函数start(){
var images=document.getElementsByTagName(“img”);
对于(var i=0;i
这是因为范围。每次循环时,图像值都会再次设置。因此,它将始终传递循环中的最后一个图像 你可以做两件事。使用如下所示的
此
。或者创建一个匿名函数
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="style.css" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Sample Page</title>
</head>
<body onload="start()">
<script type="text/javascript">
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
var image=images[i];
image.addEventListener('click', function(){
imageClicked(image);
});
}
}
function imageClicked(image){
alert(image.src)
}
</script>
<div id="main">
<div id="center">
<button>نمایش اسلایدی</button>
</div>
<div id="gallery">
<div id="img1" class="image">
<img src="../images/1.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img2" class="image">
<img src="../images/2.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img" class="image">
<img src="../images/3.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
</div>
</div>
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', function(){
imageClicked(this);
});
}
}
// Or even better
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', imageClicked);
}
}
function imageClicked(){
alert(this.src); // this refers to the image
}
函数开始(){
var images=document.getElementsByTagName(“img”);
对于(var i=0;i
匿名功能:
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
(function(image){
image.addEventListener('click', function(){
imageClicked(image); // Use the element clicked object (this)
});
})(images[i]);
}
}
函数开始(){
var images=document.getElementsByTagName(“img”);
对于(var i=0;i
这是因为范围。每次循环时,图像值都会再次设置。因此,它将始终传递循环中的最后一个图像
你可以做两件事。使用如下所示的此
。或者创建一个匿名函数
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="style.css" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Sample Page</title>
</head>
<body onload="start()">
<script type="text/javascript">
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
var image=images[i];
image.addEventListener('click', function(){
imageClicked(image);
});
}
}
function imageClicked(image){
alert(image.src)
}
</script>
<div id="main">
<div id="center">
<button>نمایش اسلایدی</button>
</div>
<div id="gallery">
<div id="img1" class="image">
<img src="../images/1.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img2" class="image">
<img src="../images/2.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img" class="image">
<img src="../images/3.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
</div>
</div>
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', function(){
imageClicked(this);
});
}
}
// Or even better
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', imageClicked);
}
}
function imageClicked(){
alert(this.src); // this refers to the image
}
函数开始(){
var images=document.getElementsByTagName(“img”);
对于(var i=0;i
匿名功能:
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
(function(image){
image.addEventListener('click', function(){
imageClicked(image); // Use the element clicked object (this)
});
})(images[i]);
}
}
函数开始(){
var images=document.getElementsByTagName(“img”);
对于(var i=0;i
您想要的是这样的:
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', function(){
imageClicked(this);
});
}
}
function imageClicked(image){
alert(image.src)
}
函数开始(){
var images=document.getElementsByTagName(“img”);
对于(var i=0;i
在编写的代码中,您复制了image元素,然后将eventListener分配给对象的副本。因为此副本被多次重写,imageClicked被唯一一个没有被重写的引用,即最后一个图像。
此
是指回调函数中的实际图像元素。您需要的是如下内容:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="style.css" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Sample Page</title>
</head>
<body onload="start()">
<script type="text/javascript">
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
var image=images[i];
image.addEventListener('click', function(){
imageClicked(image);
});
}
}
function imageClicked(image){
alert(image.src)
}
</script>
<div id="main">
<div id="center">
<button>نمایش اسلایدی</button>
</div>
<div id="gallery">
<div id="img1" class="image">
<img src="../images/1.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img2" class="image">
<img src="../images/2.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img" class="image">
<img src="../images/3.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
</div>
</div>
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', function(){
imageClicked(this);
});
}
}
// Or even better
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', imageClicked);
}
}
function imageClicked(){
alert(this.src); // this refers to the image
}
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', function(){
imageClicked(this);
});
}
}
function imageClicked(image){
alert(image.src)
}
函数开始(){
var images=document.getElementsByTagName(“img”);
对于(var i=0;i
在编写的代码中,您复制了image元素,然后将eventListener分配给对象的副本。因为此副本被多次重写,imageClicked被唯一一个没有被重写的引用,即最后一个图像。
此
是指回调函数中的实际图像元素。标题与标记不同stitle与标记不同
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link rel="stylesheet" href="style.css" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Sample Page</title>
</head>
<body onload="start()">
<script type="text/javascript">
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
var image=images[i];
image.addEventListener('click', function(){
imageClicked(image);
});
}
}
function imageClicked(image){
alert(image.src)
}
</script>
<div id="main">
<div id="center">
<button>نمایش اسلایدی</button>
</div>
<div id="gallery">
<div id="img1" class="image">
<img src="../images/1.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img2" class="image">
<img src="../images/2.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
<div id="img" class="image">
<img src="../images/3.jpg"></img>
<div id="title">
<label>عکس</label>
</div>
</div>
</div>
</div>
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', function(){
imageClicked(this);
});
}
}
// Or even better
function start(){
var images = document.getElementsByTagName("img");
for ( var i = 0; i < images.length; i++) {
images[i].addEventListener('click', imageClicked);
}
}
function imageClicked(){
alert(this.src); // this refers to the image
}