append.js

function append(arg){
  if(typeof arg === "string"){
    this.innerHTML = arg;
  }else{
    var df = document.createDocumentFragment();
    for(var i=0, l=arguments.length; i<l; i++){
      if(arguments[i].nodeType == 1){
        alert(111);
        df.appendChild(arguments[i]);
      }
    }
    console.dir(df);
    this.appendChild(df);
  }
}

//var wrapper = document.getElementById("test");
//var elm = document.createElement("div");
//elm.innerHTML = "test div";
//append.call(wrapper, elm2);