我正在构建一个背景img幻灯片,并且遇到了我无法理解的故障。
我有几个包含图像列表的对象。我有两个函数可以拍摄这些图像,每个图像创建一个div,并添加imgs作为这些div的背景,所有这些都在一个容器中。
然后,如this website中所述,我淡出第一个div,然后淡出第二个div,然后将第一个孩子移动到最后一个子位置,然后循环,创建幻灯片效果。
当我希望这个超过i .empty()容器时。然后,该过程可以使用相同或另一个对象重新开始。
我第一次这样做,它有效,但第二次,第三次......次,它开始出现故障。不仅有两个,而且所有的div都开始淡入淡出,因为我不知道是什么原因
即使我在第一次,第二次,第三次尝试中使用相同的对象,也会发生这种情况。
看起来虽然div已经从DOM中删除了,但显然它们有一些记忆?是否与创建的div与以前创建的div共享名称这一事实有关?也许fadein out保留一些我不知道的内部队列?
这是一个JsFiddle:
https://jsfiddle.net/93h51k9m/11/
和代码:
$(document).ready(function(){
var imgObject = {
imgs: ['http://lorempixel.com/400/200/sports/1/','http://lorempixel.com/400/200/sports/2/','http://lorempixel.com/400/200/sports/3/']
};
var imgObject2 = {
imgs: ['http://lorempixel.com/400/200/sports/4/','http://lorempixel.com/400/200/sports/5/','http://lorempixel.com/400/200/sports/6/']
};
var noImgObject = {
};
function prepare(index) {
if ($("#cover").css("display") != "none") {
console.log("cover is visible: hide it first");
console.log("fadeOut cover in 3000ms");
$("#cover").fadeOut(3000, function() {
console.log("then empty cover")
$("#cover").empty();
console.log("now for the images")
roll(index);
});
} else {
console.log("cover is already hidden: now for the images");
roll(index);
};
};
function roll(index) {
if (typeof index.imgs != "undefined") {
console.log("called object has images")
console.log("get them and their numbers")
var imgs = index.imgs;
var imgsLength = imgs.length;
console.log("create as many divs as imgs, and place each img as bg in each div")
for (i = 0; i < imgsLength; i++) {
$("#cover").append("<div class='imgdiv" + i + "'></div>");
$(".imgdiv" + i).css("background-image", "url('"+imgs[i]+"')");
};
console.log("now hide all but first div, fadeIn cover and start the carousel");
//as seen at http://snook.ca/archives/javascript/simplest-jquery-slideshow
$('#cover').fadeIn(3000);
$('#cover div:gt(0)').hide();
setInterval(function() {
console.log("fade and swap")
$('#cover :first-child').fadeOut(3000)
.next('div').fadeIn(3000)
.end().appendTo('#cover')
}, 6000);
} else {
console.log("index has no images, nothing to do");
};
};
$("#imgobj").click(function(){
console.log("imgObject called");
prepare(imgObject);
});
$("#imgobj2").click(function(){
console.log("imgObject2 called");
prepare(imgObject2);
});
$("#noimgobj").click(function(){
console.log("noImgObject called");
prepare(noImgObject);
});
});
谢谢
答案 0 :(得分:0)
每次调用
中click
事件时,都会启动另一个间隔,这就是原因,操作会附加在queue
每次启动新的Interval时,都会使用global
变量来保存setInterval
实例和clear
。
var interval;
$(document).ready(function() {
var imgObject = {
imgs: ['http://lorempixel.com/400/200/sports/1/', 'http://lorempixel.com/400/200/sports/2/', 'http://lorempixel.com/400/200/sports/3/']
};
var imgObject2 = {
imgs: ['http://lorempixel.com/400/200/sports/4/', 'http://lorempixel.com/400/200/sports/5/', 'http://lorempixel.com/400/200/sports/6/']
};
var noImgObject = {};
function prepare(index) {
clearInterval(interval);
if ($("#cover").css("display") != "none") {
console.log("cover is visible: hide it first");
console.log("fadeOut cover in 3000ms");
$("#cover").fadeOut(3000, function() {
console.log("then empty cover")
$("#cover").empty();
console.log("now for the images")
roll(index);
});
} else {
console.log("cover is already hidden: now for the images");
roll(index);
};
};
function roll(index) {
if (typeof index.imgs != "undefined") {
console.log("called object has images")
console.log("get them and their numbers")
var imgs = index.imgs;
var imgsLength = imgs.length;
console.log("create as many divs as imgs, and place each img as bg in each div")
for (var i = 0; i < imgsLength; i++) {
$("#cover").append("<div class='imgdiv" + i + "'></div>");
$(".imgdiv" + i).css("background-image", "url('" + imgs[i] + "')");
};
console.log("now hide all but first div, fadeIn cover and start the carousel");
//as seen at http://snook.ca/archives/javascript/simplest-jquery-slideshow
$('#cover').fadeIn(3000);
$('#cover div:gt(0)').hide();
interval = setInterval(function() {
console.log("fade and swap")
$('#cover :first-child').fadeOut(3000)
.next('div').fadeIn(3000)
.end().appendTo('#cover')
}, 6000);
} else {
console.log("index has no images, nothing to do");
};
};
$("#imgobj").click(function() {
console.log("imgObject called");
prepare(imgObject);
});
$("#imgobj2").click(function() {
console.log("imgObject2 called");
prepare(imgObject2);
});
$("#noimgobj").click(function() {
console.log("noImgObject called");
prepare(noImgObject);
});
});
&#13;
html {
color: black;
height: 100%;
padding: 0;
margin: 0;
overflow: hidden;
}
body {
height: 100%;
padding: 0;
margin: 0;
background: #f7fafa;
}
* {
box-sizing: border-box;
}
button {
cursor: pointer;
}
#buttons {
z-index: 1000;
}
#cover {
display: none;
position: fixed;
top: 5vh;
left: 0;
width: 100vw;
height: 95vh;
opacity: 0.5;
z-index: 0;
}
#cover div {
position: absolute;
top: 0;
left: 0;
width: 100vw;
height: 100vh;
background-repeat: no-repeat;
background-size: cover;
}
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div id="buttons">
<button id="imgobj">imgObject</button>
<button id="imgobj2">imgObject2</button>
<button id="noimgobj">noImgObject</button>
</div>
<div id="cover"></div>
&#13;