console 命令行工具 X clear

console

document.write("<pre>Javascript");
document.write("CSS");
document.write("HTML</pre>");

document.write("<br/>");

document.writeln("<pre>Javascript");
document.writeln("CSS");
document.writeln("HTML</pre>");

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