HTML如何在两个div标签中间画一条竖线

function myfun(){ 

  var p1=document.getElementById("content"); 

  var p2=document.getElementById("side"); 

  var h1=p1.offsetHeight; 

  var h2=p2.offsetHeight; 

    if(h1>h2){ 

        p1.style.borderRight="1px dashed #B6AEA3"; 

    }else{ 

        p2.style.borderLeft="1px dashed #B6AEA3"; 

  } 

}