???html部分
js部分
<script>
var x1=document.getElementById('x1');
var x2=document.getElementById('x2');
var x3=document.getElementById('x3');
var x4=document.getElementById('x4');
var x5=document.getElementById('x5');
function getrandom(n,m){
return Math.round(Math.random()*(m-n)+n);
}
function fn(obj){
var x=getrandom(0,document.documentElement.clientWidth-100);
var y=getrandom(0,document.documentElement.clientHeight-100);
obj.style.left=x+'px';
obj.style.top=y+'px';
}
fn(x1);
fn(x2);
fn(x3);
fn(x4);
fn(x5);
window.setInterval(function (){
fn(x1);
fn(x2);
fn(x3);
fn(x4);
fn(x5);
},500);
</script>
