console 命令行工具 X clear
console
<!doctype html>

<html>

<head></head>

<body>
    <div id="box" style="width:252px;
    font:25px/25px 宋体;
    background:#000;
    color:#9f9;
    border:#999 20px ridge;
    text-shadow:2px 3px 1px #0f0;">
    </div>

    <script>
        var ele = document.getElementById("box")
        ele.innerHTML += "aaaa"
        ele.innerHTML += "<br>"
    </script>
</body>

</html>