今天主要是学习如何使用JS，第一个就是先是使用JS输出"Hello world"
<!doctype html>
<html lang="en">
<head>
<meta http-equiv = "content-type" content = "text/html; charset=UTF-8">
<title>Document</title>
<script type = "text/javascript">
document.write("Hello wlord");/*输出Hello wrold*/
document.body.bgColor = "red";/*body背景颜色*/
</script>
</head>
<body> </body>
</html>
效果图如下：
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第二个课堂练习就是使用JS输出一个表格，源码如下：
<!doctype html>
<html lang="en">
<head>
<meta http-equiv = "content-type" content = "text/html; charset=UTF-8">
<title>Document</title>
<title>Document</title>
<script type = "text/javascript">
window.alert(1+1);/*使用弹窗输出*/
document.write("<h2>个人信息</h2>");
document.write("<ol>");
document.write("<li>姓名：叭叭叭</li>");
document.write("<li>性别：男</li>");
document.write("<li>年龄：38</li>");
document.write("<li>职业：演员</li>");
document.write("<li>经纪人：隔壁老宋</li>");
document.write("</ol>");
</script>
</head>
<body>
</body>
</html>
效果如下：
先有个弹窗：
当弹窗关闭后：
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第三个课堂练习就是在上个练习的基础上进行更详细的书写：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
<script type = "text/javascript">
var user_name = "Ld";
var age = 38;
var job = "演员";
var jjr = "隔壁老宋"; document.write("<ol>");
document.write("<h2>");
document.write(user_name);
document.write("的个人信息</h2>");
document.write("<li>姓名：");
document.write(user_name);
document.write("</li>");
document.write("<li>年龄：");
document.write(age);
document.write("</li>");
document.write("<li>职业：");
document.write(job);
document.write("</li>");
document.write("<li>经纪人：");
document.write(jjr);
document.write("</li>");
document.write("</ol>");
</script>
</head>
<body> </body>
</html>
效果如图：
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再下个练习就是对代码进行优化，使用+号将字符串链接起来：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
<script type = "text/javascript">
var user_name = "LD";
var age = 38;
var job_= "演员"; document.write("<h2>"+user_name+"的个人信息</h2>");
document.write("<ol>");
document.write("<li>姓名"+user_name+"</li>");
document.write("<li>年龄"+age+"</li>");
document.write("<li>工作"+job+"</li>");
document.write("</ol>");
</script>
</head>
<body> </body>
</html>
效果如图：
=======================================================
下一个练习是关于事件的
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Generator" content="EditPlus®">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
<title>Document</title>
</head>
<body>
<img src = "Images/jd1.png" id = "Images_01"> <!--显示图片-->
<script type = "text/javascript">
var imgObj = document.getElementById("Images_01"); /*获取图片*/
imgObj.onmouseover = function(){ /*调用鼠标经过时的事件方法*/
imgObj.src = "Images/jd2.png";
}
imgObj.onmouseout = function(){ /*调用鼠标离开时的事件方法*/
imgObj.src = "Images/jd1.png";
}
</script>
</body>
</html>
鼠标未经过时：
鼠标经过后：
