*{
	padding: 0;
	margin: 0;
}
body,html{
	width: 100%;
	height: 100%;
	overflow: hidden;
}
#bottom_box{
	width: 100%;
	height: 50px;
	background-color: #eee;
	display: flex;   //这是flex布局，父元素设置为flex，子元素设置几等份就是分成几等份
	position: fixed;
	bottom: 0px;
}
.tab{
	flex:1;    //子元素都平均是1：1：1：1的意思
	text-align: center;
	padding-top:5px; 
}
img{
	width: 22px;
}
#main_container{
	width: 400%;
	height: 100%;
	overflow: hidden;
	position: relative;
	transition:left .5s ease;  //transition是css3的动画，能够平滑的过渡效果，兼容移动端
}
#box_01,#box_02,#box_03,#box_04{
	width: 25%;
	height: 100%;
	float: left;
}
#box_01{
	background-color: #ccc;
}
#box_02{
	background-color: pink;
}
#box_03{
	background-color: red;
}
#box_04{
	background-color: green;
}

<div id="main_container" style="left:0%">
	<div id="box_01">01</div>
	<div id="box_02">02</div>
	<div id="box_03">03</div>
	<div id="box_04">04</div>
</div>

<div id="bottom_box">
	<div id="tab_01" class="tab" style="background-color:orange" onclick="hintShow(0)">
		<img src="http://www.mamicode.com/1.png" />
		<div class="tab_word_01">首页</div>
	</div>
	<div id="tab_02" class="tab" onclick="hintShow(1)">
		<img src="http://www.mamicode.com/1.png" />
		<div class="tab_word_01">药箱</div>
	</div>
	<div id="tab_03" class="tab" onclick="hintShow(2)">
		<img src="http://www.mamicode.com/1.png" />
		<div class="tab_word_01">购物车</div>
	</div>
	<div id="tab_04" class="tab" onclick="hintShow(3)">
		<img src="http://www.mamicode.com/1.png" />
		<div class="tab_word_01">个人中心</div>
	</div>
</div>

var main_container=document.getElementById(‘main_container‘);
var tab_01=document.getElementById(‘tab_01‘);
var tab_02=document.getElementById(‘tab_02‘);
var tab_03=document.getElementById(‘tab_03‘);
var tab_04=document.getElementById(‘tab_04‘);

function hintShow(ele){
	if(ele==0){
		main_container.style.left="0%";
		tab_01.style.backgroundColor="orange";
		tab_02.style.backgroundColor="";
		tab_03.style.backgroundColor="";
		tab_04.style.backgroundColor="";
	}else if(ele==1){
		main_container.style.left="-100%";
		tab_01.style.backgroundColor="";
		tab_02.style.backgroundColor="orange";
		tab_03.style.backgroundColor="";
		tab_04.style.backgroundColor="";
	}else if(ele==2){
		main_container.style.left="-200%";
		tab_01.style.backgroundColor="";
		tab_02.style.backgroundColor="";
		tab_03.style.backgroundColor="orange";
		tab_04.style.backgroundColor="";
	}else if(ele==3){
		main_container.style.left="-300%";
		tab_01.style.backgroundColor="";
		tab_02.style.backgroundColor="";
		tab_03.style.backgroundColor="";
		tab_04.style.backgroundColor="orange";
	}
}