文字垂直自带换行

效果

css

                        .col{
                                width:6px;
                                height: 50px;
                                margin: 0 auto;  
                                font-size: 20px;
                                letter-spacing:1.5px;
                                writing-mode:vertical-lr;/*从左向右 从右向左是 writing-mode: vertical-rl;*/  
                                writing-mode:tb-lr;/*IE浏览器的从左向右 从右向左是 writing-mode: tb-rl；*/  
                            }