SOURCE

/*window.onload=function(){
//给body添加一个div元素，div里面要包括一个p元素，p元素里有很多文本
var oDiv=document.createElement("div");
var oP=document.createElement("p");
oDiv.appendChild(oP);
var oText=document.createTextNode("Hi from Dynamic DOM");
oP.appendChild(oText);

var oP1=document.createElement("p");
oDiv.appendChild(oP1);
var oText1=document.createTextNode("Hi long time no see");
oP.appendChild(oText1);

document.body.appendChild(oDiv);

var oDiv1=document.createElement("div");
document.body.appendChild(oDiv1);
oDiv1.innerHTML="<p>Hi from innerHTML</p >\
<p>Hi how are you</p >\
<p>what is your name</p >";
console.log("line20:"+oDiv1.innerText);
}*/

window.onload = function ()
{
document.body.innerHTML = '<input id="btn" type="button" value="按钮1">';
var ok = document.createElement("input"); 
document.body.appendChild(ok);
ok.type = "button";
ok.value = "按钮2";
ok.id = "btn";
}