利用flex可以方便快捷的帮助我们进行网页布局，不过由于历史标准很多，人工书写会有一些兼容性问题，这里将在网上搜集到的兼容性的写法放在博客中，以便取用。

flex：定义布局为盒模型

.flex {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
}

flex-v：盒模型垂直布局

.flex-v {
    -webkit-box-orient: vertical;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
}

flex-1：子元素占据剩余的空间

.flex-1 {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
}

flex-align-center：子元素垂直居中

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

flex-pack-center：子元素水平居中

.flex-pack-center {
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}

flex-pack-justify：子元素两端对齐

.flex-pack-justify {
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
}

下面是压缩版本

.flex{display: -webkit-box;display: -webkit-flex;display: -ms-flexbox;display: flex;}
.flex-v{-webkit-box-orient: vertical;-webkit-flex-direction: column;-ms-flex-direction: column;flex-direction: column;}
.flex-1{-webkit-box-flex: 1;-webkit-flex: 1;-ms-flex: 1;flex: 1;}
.flex-align-center{-webkit-box-align: center;-webkit-align-items: center;-ms-flex-align: center;align-items: center;}
.flex-pack-center{-webkit-box-pack: center;-webkit-justify-content: center;-ms-flex-pack: center;justify-content: center;}
.flex-pack-justify{-webkit-box-pack: justify;-webkit-justify-content: space-between;-ms-flex-pack: justify;justify-content: space-between;}