<!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">
<title>Document</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<style type="text/css">
.col-md-1{
border: 1px solid black;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
<div class="col-md-1">哈哈哈</div>
</div>
</div>
</body>
</html>
上面这段代码，用的是md的宽度，http://v3.bootcss.com/css/#grid-options
官方文档说，md的container的最大宽度是970px，但是为什么 上面这段代码container的宽度是1170px
