console 命令行工具 X clear

console

document.write("Welcome") ;

function callAlert(){
    alert('我被点了一下');
}

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <button onclick="alert('我被点击')">点我</button>
    <button onclick="callAlert('')">点我一下</button>
    <script>
        //alert("Hi!");
    </script>
</body>
</html>