*{

	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="1.png" />

		<div class="tab_word_01">首页</div>

	</div>

	<div id="tab_02" class="tab" onclick="hintShow(1)">

		<img src="1.png" />

		<div class="tab_word_01">药箱</div>

	</div>

	<div id="tab_03" class="tab" onclick="hintShow(2)">

		<img src="1.png" />

		<div class="tab_word_01">购物车</div>

	</div>

	<div id="tab_04" class="tab" onclick="hintShow(3)">

		<img src="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";

	}

}