[英]Image Slider- Javascript
Anyone have a clue why this code isn't changing my images through 1.fw.png to 5.fw.png? 有人知道为什么这段代码没有通过1.fw.png到5.fw.png更改我的图像吗?
HTML HTML
<div id="slideshow">
<img id="slider" src="1.fw.png">
</div>
JavaScript JavaScript的
function timer(x){
var timer = setTimeout(function () {switchPic(x);}, 4000);
}
function switchPic(x){
x += 1;
document.getElementById('slider').src = x + ".fw.png";
}
$(document).ready()(function(){
document.getElementById('slider').src = x;
timer(x);
});
A Image Changer with a transition would be a benefit, but just changing the images is the essential requirement. 带有过渡的Image Changer将是一个好处,但是仅更改图像是基本要求。
x
is a local variable (a parameter) so the increment change does not live past the switchPic
function. x
是局部变量(参数),因此增量更改不会超过switchPic
函数。 If there is a global x
then it is shadowed; 如果有一个全局
x
那么它就会被遮盖; otherwise timer(x)
will have resulted in a ReferenceError - make sure do describe what "isn't working" and how such is known. 否则,
timer(x)
将导致ReferenceError-确保确实描述什么 “无效”以及如何得知。
I might write it like so: 我可能会这样写:
jQuery(function ($) {
var t = -1; // initial value peicked so x is 1 at first interval
function switchIt () {
t++; // change variable caught in closure
var x = (t % 5) + 1; // loops through values in 1..5
$('#slider').attr("src", x + ".fw.png");
}
// set initial image right away
switchIt();
// switch image every 4 seconds, forever
setInterval(switchIt, 4000);
});
Thank you user2864740, I re-wrote the code using your information and it loops at the correct number now too. 谢谢user2864740,我用您的信息重新编写了代码,它现在也以正确的数字循环。
$(document).ready(function(){
setInterval(function(){
z = document.getElementById('slider').src;
y = z.indexOf(".fw.png");
y = z.slice(y - 1, -7);
x = parseInt(y);
y = (x % 5) + 1;
document.getElementById('slider').src = "/Images/Index/Slider/" + y + ".fw.png";
},4000);
});
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