我在项目中使用Unslider（http://unslider.com/）。
我成功地将整个滑块部分与目标对齐了一半。 但问题是 1920和更低宽度分辨率的幻灯片不居中。图像的宽度为3940像素。
我尝试应用this回答中的代码;像这样：
$(function () {
$('.banner').unslider();
AdjustSliderImgWrapper();
});
$(window).resize(AdjustSliderImgWrapper);
function AdjustSliderImgWrapper() {
var left = (parseInt($('.banner > li > img').width()) - $('.banner > li').innerWidth()) / -2;
$('.banner > li > img').css('left', left);
}
，但无济于事。我也尝试过：
$(".banner img").each(function () {
$(this).css("margin-left", -this.width / 2);
})
也：
background-position: center center !important;
这是我的代码：
window.console && console.warn("This version of Unslider is due to be deprecated by December 1. Please visit unslider.com for details on how to upgrade."), function (t, s) {
if (!t)
return s;
var i = function () {
this.el = s,
this.items = s,
this.sizes = [],
this.max = [0, 0],
this.current = 0,
this.interval = s,
this.opts = {
speed : 500,
delay : 3e3,
complete : s,
keys : !s,
dots : s,
fluid : s
};
var i = this;
this.init = function (s, i) {
return this.el = s,
this.ul = s.children("ul"),
this.max = [s.outerWidth(), s.outerHeight()],
this.items = this.ul.children("li").each(this.calculate),
this.opts = t.extend(this.opts, i),
this.setup(),
this
},
this.calculate = function (s) {
var e = t(this),
n = e.outerWidth(),
h = e.outerHeight();
i.sizes[s] = [n, h],
n > i.max[0] && (i.max[0] = n),
h > i.max[1] && (i.max[1] = h)
},
this.setup = function () {
if (this.el.css({
overflow : "hidden",
width : i.max[0],
height : this.items.first().outerHeight()
}), this.ul.css({
width : 100 * this.items.length + "%",
position : "relative"
}), this.items.css("width", 100 / this.items.length + "%"), this.opts.delay !== s && (this.start(), this.el.hover(this.stop, this.start)), this.opts.keys && t(document).keydown(this.keys), this.opts.dots && this.dots(), this.opts.fluid) {
var e = function () {
i.el.css("width", Math.min(Math.round(i.el.outerWidth() / i.el.parent().outerWidth() * 100), 100) + "%")
};
e(),
t(window).resize(e)
}
this.opts.arrows && this.el.parent().append('<p class="arrows"><span class="prev">â†</span><span class="next">→</span></p>').find(".arrows span").click(function () {
t.isFunction(i[this.className]) && i[this.className]()
}),
t.event.swipe && this.el.on("swipeleft", i.prev).on("swiperight", i.next)
},
this.move = function (s, e) {
this.items.eq(s).length || (s = 0),
0 > s && (s = this.items.length - 1);
var n = this.items.eq(s),
h = {
height : n.outerHeight()
},
o = e ? 5 : this.opts.speed;
this.ul.is(":animated") || (i.el.find(".dot:eq(" + s + ")").addClass("active").siblings().removeClass("active"), this.el.animate(h, o) && this.ul.animate(t.extend({
left : "-" + s + "00%"
}, h), o, function () {
i.current = s,
t.isFunction(i.opts.complete) && !e && i.opts.complete(i.el)
}))
},
this.start = function () {
i.interval = setInterval(function () {
i.move(i.current + 1)
}, i.opts.delay)
},
this.stop = function () {
return i.interval = clearInterval(i.interval),
i
},
this.keys = function (s) {
var e = s.which,
n = {
37 : i.prev,
39 : i.next,
27 : i.stop
};
t.isFunction(n[e]) && n[e]()
},
this.next = function () {
return i.stop().move(i.current + 1)
},
this.prev = function () {
return i.stop().move(i.current - 1)
},
this.dots = function () {
var s = '<ol class="dots">';
t.each(this.items, function (t) {
s += '<li class="dot' + (1 > t ? " active" : "") + '">' + (t + 1) + "</li>"
}),
s += "</ol>",
this.el.addClass("has-dots").append(s).find(".dot").click(function () {
i.move(t(this).index())
})
}
};
t.fn.unslider = function (s) {
var e = this.length;
return this.each(function (n) {
var h = t(this),
o = (new i).init(h, s);
h.data("unslider" + (e > 1 ? "-" + (n + 1) : ""), o)
})
}
}
(window.jQuery, !1);* {
margin: 0;
padding: 0;
}
#outermin1 {
width : 100%;
}
.banner {
position : relative;
width : auto !important;
overflow : auto;
text-align : center;
}
/*
*/
.banner ul {
list-style : none;
width : 300%;
padding: 0px;
}
.banner ul li {
display : block;
float : left;
width : 33%;
padding : 0 0 110px;
min-height: 1550px !important;
max-height: 1550px !important;
}
.banner h1 {
position : relative;
margin : 0 auto;
height : 120px;
top : 30px;
text-align : center;
font-size : 250% !important ;
color : #FFF;
text-transform : uppercase;
font-weight : 100;
/*line-height : 38px !important ;*/
}
.banner h2 {
text-transform : none;
font-size : 150%;
top : -15px;
position : relative;
color : #FFF;
}
.banner .btn {
display : inline-block;
margin : 25px 0 0;
padding : 9px 22px 7px;
clear : both;
color : #fff;
font-size : 12px;
font-weight : 700;
text-transform : uppercase;
text-decoration : none;
border : rgba(255, 255, 255, 0.4) solid 2px;
border-radius : 5px;
}
.banner .btn:hover {
background : rgba(255, 255, 255, 0.05);
}
.banner .dots {
position: absolute;
left: 0px;
right: 0px;
bottom: -10px;
background: #fff;
height: 103px;
padding-top: 30px;
}
.banner .dots li {
display : inline-block;
width : 10px;
height : 10px;
margin : 0 4px;
text-indent : -999em;
border : #17b7a5 solid 2px;
border-radius : 6px;
cursor : pointer;
opacity : 0.4000000059604644775390625;
transition : background 0.5s, opacity 0.5s;
}
.banner .dots li.active {
background : #17b7a5;
opacity : 1;
}
/*
.banner img {
width: 100%;
margin-top: -143px;
}*/
.banner img {
background-size: cover;
z-index: 3;
}
/* this is the tryout part */
.banner > li { position: relative; }
.banner > li > img { position: absolute; top: 0; width: 3940px !important; text-align: center;}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="favicon.ico">
<title>theimapcter.org</title>
<!-- Bootstrap core CSS -->
<link href="css/bootstrap.min.css" rel="stylesheet">
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<link href="css/ie10-viewport-bug-workaround.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="css/banner.css" rel="stylesheet">
<link href="css/egyedi.css" rel="stylesheet"> <!-- a kialakitas -->
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<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script src="js/unslider.min.js"></script>
<script type="text/javascript">
$(function() {
$('.banner').unslider({
speed: 500,
delay: 15000,
complete: function() {},
keys: true,
dots: true,
fluid: true
});
});
</script>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#"><img src="svg/impacter_logo_fejlec.svg" alt="logo"></a>
</div>
<div id="navbar" class="collapse navbar-collapse" >
<ul class="nav navbar-nav">
<li><a href="">Projects</a></li>
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<li><a href="">Search</a></li>
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</ul>
</div>
</nav>
<div class="box" id="outermin1" style="z-index:4">
<!--banner-->
<div class="banner">
<ul>
<li style="background:#00b8a5;"><div class="slider-wrapper"><div class="slide-outer"><div class="slide-szoveg">
<h1 class="cim1">Do you have the ability to respond challenges?</h1><h2 class="cim2">In other words: how do you deal with responsibility?</h2><br/><div class="start-slide"><span class="start-slide1">Start</span><br/><span class="start-slide2">the responsibility quick TEST!</span></div><span class="join-slide">Join the social experiment</span>
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</li>
<li style="background:#8fc453;"><div class="slider-wrapper"><div class="slide-outer"><div class="slide-szoveg">
<h1 class="cim3">Projects with real-life impact</h1><h2 class="cim3">Activate ideas to generate change </h2><br/><br/><span>Upload a challenge</span> <span>Join a project</span></div></div><img src="https://dl.dropboxusercontent.com/s/7l99ejj81bd2g1d/slide2.png" alt="World map" class="slide2" /></div>
</li>
<li style="background:#37c6ea;"><div class="slider-wrapper"><div class="slide-outer"><div class="slide-szoveg">
<h1>Develop new ways to solve actual social / environmental challenges</h1><br/><br/><h2><strong class="line2">– meanwhile learn about yourself.</strong></h2><span>Challenges</span><span>Taking<br/>the responsibility</span><span>Response</span><span>Make an impact</span></div></div><img src="https://dl.dropboxusercontent.com/s/geiezcd6hym6mxt/slide3.png" alt="people on pc" class="slide3" /></div></li>
</ul>
<div style="height:50px;"> </div>
</div>
</div>
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<div class="container">
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<h2>Heading</h2>
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<h2>Heading</h2>
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</div>
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<h2>Heading</h2>
<p>Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Vestibulum id ligula porta felis euismod semper. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
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修改2016.07.23。： 我忘了提到，我只想将图像的1920px部分居中。
答案 0 :(得分：0)
解决方案是：将图像包装在父类中，并将子类添加到图像中，
<span class="parent"><img class="child"...>
并给他们中心，如下：
.parent {
position: relative;
overflow: hidden;
}
.child {
position: absolute;
left: -9999px;
right: -9999px;
margin: auto;
}
然后向overflow:hidden;添加.banner ul li，以便div不会相互重叠。
答案 1 :(得分：0)
我更喜欢另一种技巧。我不知道您的特定滑块是否可以为div设置动画，但您可以将图像作为背景图像提供给该div。使用background-size: cover;，浏览器将始终为您选择合适的大小。