指定意义的颜色类
  通过指定意义的颜色类可以为表格的行或者单元格设置颜色:
            
  
    
      
        | Firstname | Lastname | Email | 
    
    
      
        | Default | Defaultson | def@somemail.com | 
      
      
        | Primary | Joe | joe@example.com | 
      
        | Success | Doe | john@example.com | 
      
        | Danger | Moe | mary@example.com | 
      
        | Info | Dooley | july@example.com | 
      
        | Warning | Refs | bo@example.com | 
      
        | Active | Activeson | act@example.com | 
      
        | Secondary | Secondson | sec@example.com | 
      
        | Light | Angie | angie@example.com | 
      
        | Dark | Bo | bo@example.com |