Html
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.container {
	width:425px;
	height:325px;
	margin:0 auto;
	border:1px solid #ddd;
	position:relative;
	overflow:hidden;
}
.container:hover .btn {
	display:block;
}
img {
	width:425px;
	height:100%;
	float:left;
}
.btn {
	display:inline-block;
	border:20px solid transparent;
	position:absolute;
	top:40%;
	cursor:pointer;
	opacity:.5;
	display:none;
}
.btn:hover {
	opacity:1;
}
#prev {
	border-right:20px solid pink;
}
#next {
	border-left:20px solid pink;
	right:0;
}
.imgCon {
	position:absolute;
	width:1700px;
	height:100%;
}

                        
↑上面代码改变,会自动显示代码结果 jQuery调用版本:1.11.3
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