var img=document.getElementById("hd");
var txt=document.createTextNode("aaaaaaaaaaaaaaaaaaa");
var ss=document.getElementById("p1");
ss.replaceChild(txt,img);
//ss.insertBefore(txt,img);
//ss.removeChild(img);
//ss.appendChild(new);//添加一个子结点
var img=document.getElementById("hd");
var txt=document.createTextNode("aaaaaaaaaaaaaaaaaaa");
var ss=document.getElementById("p1");
ss.replaceChild(txt,img);
//ss.insertBefore(txt,img);
//ss.removeChild(img);
//ss.appendChild(new);//添加一个子结点