Html5移动端div固定到底部实现底部导航条的几种方式，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧
需求：
需要把导航固定在底部?只能滑动内容，导航菜单固定不动的。效果如下：
这篇文章主要讲解三种实现方案，包括：fixed,absolute,以及css3的flex布局。
html结构如下：
滚动区域
底部固定菜单
方法一：使用fixed
.box{
.roll{
padding-bottom:1rem;
}
footer{
position:fixed;bottom:0;z-index:999;
}
}
方法二：使用absolute
.box{
position: relative;height: 100%;
.roll{
position: absolute;bottom:1rem;top: 0;overflow-y: scroll;-webkit-overflow-scrolling: touch;height: auto;
}
footer{
position: absolute;bottom:0;
}
}
方法三：使用flex
.box{
display:flex;display: -webkit-flex;height:100%;flex-direction:column;
.roll{
flex: 1; width: 100%;overflow-y: scroll;-webkit-overflow-scrolling: touch;height: auto;
}
}
总结
1、底部定位为fixed或absolute的时候，出现优先级别较低，导致被其他div覆盖的情况，那么这里就需要用到z-index，来让他成为最高级别，不至于被覆盖。
2、底部定位为fixed或absolute，存在输入框的时候，会出现如下情况：
ios：激活输入框时，底部不会弹出来(合理)。
Android：激活输入框时，底部会跟着输入框弹出来(不合理)
传统解决办法：通常将底部设置为fixed，当激活输入框的时候，将底部定位改为relative，即可兼容ios和Android。
3、使用方法二或者方法三，需要设置-webkit-overflow-scrolling 属性。这样才能保证滚动区域的流畅性，-webkit-overflow-scrolling控制元素在移动设备上是否使用滚动回弹效果。
4、在部分浏览器中设置overflow-y: scroll;会出现滚动条，这时候我们需要全局定义如下样式：
::-webkit-scrollbar{//scroll滚动条设置
width: 0px; height: 0px; color: rgb(136, 0, 0);">#fff;
}
5、移动端推荐使用方法三的布局形式。
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