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);
                  }
              }

           }