图片在div内垂直居中
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>RunJS</title>
<style>
div{
line-height: 300px;
border:1px solid red
}
img{
vertical-align: middle;
}
</style>
</head>
<body>
<div id="div1">
<img src="http://lorempixel.com/400/200/">
</div>
</body>
</html>
省略号（block，inline）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
div,p{
100px;
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
background: red;
}
span{
display: block;/* 先转化成block */
100px;
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
background: green;
}
</style>
</head>
<body>
<div>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</div>
<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</p>
<span>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</span>
</body>
</html>