How to achieve sliding door effect in js

*{
  margin: 0;
  padding: 0;
  background-color: #ccc;
}
p{
  text-align: center;
}
#container{
  width: 1130px;
  height: 350px;
  margin: 0 auto;
  border-right:1px solid #FF0000;
  border-bottom:1px solid #FF0000;
  overflow: hidden;
  position: relative;
}
#container img{
  width:500px;
  height:350px;
  display: block;
  position: absolute;
  border-bottm:1px solid #FF0000;
}

//加载dom树
window.onload = function(){
//定义盒子
var box=document.getElementById('container');
//定义图片
var imgs=box.getElementsByTagName('img');
//图片宽度
var imgWidth = imgs[0].offsetWidth;
//隐藏宽度
var exposeWidth = 210;
//盒子宽度
var boxWidth = imgWidth + (imgs.length -1) * exposeWidth;
box.style.width='px';
//设置每道门的初始位置
function SetImgsPos(){
for(var i = 1;i
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