bootstrap之按钮样式bootstrap按钮的样式，包括：btn-primary, btn-success, bt

<!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=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/bootstrap.css">
</head>
<body>
    <button class="btn btn-danger">点我</button>
    <button class="btn btn-link">点我</button>
    <input type="text" value="input按钮" class="btn btn-primary btn-lg">
    <input type="text" value="input按钮" class="btn btn-success btn-md">
    <input type="text" value="input按钮" class="btn btn-info btn-sm">
    <input type="text" value="input按钮" class="btn btn-warning btn-xs">
</body>
</html>

lg--大，md--中等，sm--小，xs--最小。