设置如下样式是可以使表格内容居中的，没有居中的原因可能是你还设置了其他的样式（把这个样式覆盖了）：

　　.table th, .table td {

　　text-align: center;

　　height:38px;

　　}

　　你可以新建一个单独的html文件复制如下代码来测试一下：

     
    
        
        
        
                rel="stylesheet">
        
    
     
    
        

                
                    

                        表格（内容居中）
                    

                    
                        
                            
                                #
                                First Name
Last Name
                                Username
                            
                        
                        
                            
                                1
                                Mark
                                Otto
                                @mdo
                            
                            
                                2
                                Jacob
                                Thornton
                                @fat
                            
                            
                                3
                                Larry the Bird
                                @twitter