基本语法HelloWorld 

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HelloWorld</title>
<script type="text/javascript">
    //借助window.onload事件,在这个页面加载完成后执行程序代码
    window.onload = function(){
        //获取按钮对象
        var btnEle = document.getElementById("btnId");
        //给按钮对象绑定单击响应函数
        btnEle.onclick = function(){
            //弹出警告框
            alert("Hello");
        };
    };
</script>
</head>
<body>
    <button id="btnId">SayHello</button>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HelloWorld空白</title>
<script type="text/javascript">
    //main
    window.onload = function(){
        //btnId
        var btnEle = document.getElementById("btnId");
        btnEle.onclick = function(){
            //alert()
            alert("Hello js!!!");
            
        }
        
    }
    
</script>
</head>
<body>
    <button id="btnId">SayHello</button>
</body>
</html>

 

posted @ 2020-10-29 15:27  凌晨四点lsj  阅读(67)  评论(0)    收藏  举报