console 命令行工具 X clear

console

document.write ("welcome to website")

function callAlert(){
    alert('我被点了一下！')
}
window.onload = function () {
        alert("欢迎光临萌萌小店！");
    }
    window.onbeforeunload = function (event) {
        var e = event || window.event;
        e.returnValue = "记得下来再来喔！";
    }

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <!--1、在head中引入-->
    
</head>
<body>
    <botton onclick="alert('我被点击啦')">点我</button>
    <botton onclick="callAlert()">点我一下</button>
     <script>
        // alert("Hi")
    </script>
    <!--2、在body中引入-->
</body>
</html>