请按照以下给定的步骤创建具有不同样式的进度条-
添加具有.progress类的<div>。
接下来，在上面的<div>中，添加一个空的<div>，其类为.progress-bar和class progress-bar- *，其中*可能是成功，信息，警告，危险。
添加一个样式属性，其宽度用百分比表示。举例来说，style =“ 60％”; 表示进度条为60％。
下面创建的进度条用于显示积极的行动和关键信息-
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet"> <script src = "/scripts/jquery.min.js"></script> <script src = "/bootstrap/js/bootstrap.min.js"></script> </head> <body> <h2>Progress Bars</h2> <div class = "progress"> <div class = "progress-bar progress-bar-success" role = "progressbar" aria-valuenow = "60" aria-valuemin = "0" aria-valuemax = "100" style = "width: 90%;"> <span class = "sr-only">90% Complete (Sucess)</span> </div> </div> <div class = "progress"> <div class = "progress-bar progress-bar-info" role = "progressbar" aria-valuenow = "60" aria-valuemin = "0" aria-valuemax = "100" style = "width: 30%;"> <span class = "sr-only">30% Complete (info)</span> </div> </div> </body> </html>