console 命令行工具 X clear

console

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

<!DOCTYPE html> 
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
        <style type="text/css">
            
        </style>
        <script>
        
        </script>
    </head>
    <body>
    </body>
</html>