原生js，插入元素

   function insert(){
             var tarDiv = document.getElementById("aId");
             var newDiv = document.createElement("div");
                 newDiv.innerHTML = "insert";
                 newDiv.id = "insert";
                 oInsert.insertAfter(newDiv, tarDiv);
          }

          var oInsert = {
             insertAfter: function(newEl, targetEl){
                 var parent = targetEl.parentNode;
                 if(parent.lastChild == targetEl){
                      parent.appendChild(newEl, targetEl);
                 }else{
                      parent.insertBefore(newEl, targetEl.nextSibling);
                 }  
             }
 
          }