console 命令行工具 X clear

console

window.onload = function(){
    var oBtn = document.getElementById("btn");
    oBtn.onclick = function() {
        alert("欢迎您！");
    }
} 

function alertMes(){
    alert("新华学院");
}

<!DOCTYPE html> 
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
        <style type="text/css">
            
        </style>
        <script>
        </script>
    </head>
    <body>
        <button onclick="alertMes()">弹出信息</button>
        <br />
        <br />
        <button id = "btn">弹出欢迎信息</button>
    </body>
</html>