有没有比这段简单的代码

网上找的，效果是达到了 ，但是boss居然不满意 ，叫我写简单点

var pos = 0;
setInterval(function(){
pos++;
if(pos>5) pos = 1;
document.getElementsByTagName("body")[0].style.background = "url(images/0"+pos+".jpg) round";
}, 3000);

function chgCol(){
pos++;
document.getElementByTagName('body')[0].sytle.background="url(images/0"+(pos>4?0:pos)+".jpg) round";
}

var pos = 0;
setInterval(chgCol(){
pos++;
if(pos>5) pos = 1;
document.getElementsByTagName("body")[0].style.background = "url(images/0"+pos+".jpg) round";
}, 3000);

 <script type="text/javascript">
    function round(i){
        if(i>5)i=1;
        setTimeOut(function(){document.getElementByTagName('body')[0].sytle.background="url(images/0"+(pos>4?0:pos)+".jpg) round";});
    }
    round(1);
</script>

<br> function round(i){</p> <pre><code> setTimeOut(function(){document.getElementByTagName(&#39;body&#39;)[0].sytle.background=&quot;url(images/0&quot;+(i++&gt;5?0:i)+&quot;.jpg) round&quot;;}); } round(1); </code></pre> <p>