连续数字和英文字母是不会换行的，需要加上下面的样式

//处理IE6等其他浏览器的不兼容。
pre{
　　white-space:pre-wrap;/*css-3*/
　　white-space:-moz-pre-wrap;/*Mozilla,since1999*/
　　white-space:-pre-wrap;/*Opera4-6*/
　　white-space:-o-pre-wrap;/*Opera7*/
　　word-wrap:break-word;/*InternetExplorer5.5+*/
}

flex布局兼容性写法

.flex {
    display: -webkit-box;
    /* 老版本语法: Safari, iOS, Android browser, older WebKit browsers. */
    display: -moz-box;
    /* 老版本语法: Firefox (buggy) */
    display: -ms-flexbox;
    /* 混合版本语法: IE 10 */
    display: -webkit-flex;
    /* 新版本语法: Chrome 21+ */
    display: flex;
    /* 新版本语法: Opera 12.1, Firefox 22+ */
}

.flex-1 {
    -webkit-box-flex: 1; /* OLD - iOS 6-, Safari 3.1-6 */
    -moz-box-flex: 1;
    /* OLD - Firefox 19- */
    -webkit-flex: 1;
    /* Chrome */
    -ms-flex: 1; /* IE 10 */
    flex: 1;
    /* NEW, Spec - Opera 12.1, Firefox 20+ */
}

.flex-center {
    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    -o-justify-content: center;
    justify-content: center;
}

.flex-between {
    -webkit-justify-content: space-between;
    -moz-justify-content: space-between;
    -ms-justify-content: space-between;
    -o-justify-content: space-between;
    justify-content: space-between;
}

.flex-direction-colomn{
    -webkit-flex-direction: column;
    -moz-flex-direction: column;
    -ms-flex-direction: column;
    -o-flex-direction: column;
    flex-direction: column;
}

.flex-end {
    -webkit-justify-content: flex-end;
    -moz-justify-content: flex-end;
    -ms-justify-content: flex-end;
    -o-justify-content: flex-end;
    justify-content: flex-end;
}

.flex-wrap {
    -webkit-flex-wrap: wrap;
    -moz-flex-wrap: wrap;
    -ms-flex-wrap: wrap;
    -o-flex-wrap: wrap;
    flex-wrap: wrap;
}

.align-item {
    -webkit-align-items: center;
    -moz-align-items: center;
    -ms-align-items: center;
    -o-align-items: center;
    align-items: center;
}