JS的with语句的简单应用
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2024-02-20 11:17:16
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例一：
<html>
<head>
<base href="<%=basePath%>">
<title>登录页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
function RegisterSubmit(){
//获取整个name为Register的form对象
with(document.Register){
var loginname=username.value;
var loginpasswd=passwd.value;
if(loginname==null || loginname==""){
alert("请填写用户名");
}else if(loginpasswd==null || loginpasswd==""){
alert("请填写密码");
}else{
document.Register.submit();
}
}
}
</script>
</head>
<body>
<form action="servlet/LoginServlet" name="Register" method="post">
<center>
<table typle="text-align:cunter" width="590" border="0" bgcolor="#8FBC8F">
<tr><td><p align="right">用户名：</p></td>
<td align="left"><input type="text" name="username" style="width:120px"/></td>
</tr>
<tr><td><p align="right">密 码：</p></td>
<td align="left"><input type="password" name="passwd" style="width:120px"/></td>
</tr>
<tr rowspan="2">
<td align="right"><input type="button" value="提交" onclick="RegisterSubmit()"/> </td>
<td align="left"><input type="reset" value="重置"/></td>
</tr>
</table>
</center>
</form>
</body>
</html>
例二：
<script language="javascript">
<!--
function Lakers() {
this.name = "kobe bryant";
this.age = "28";
this.gender = "boy";
}
var people=new Lakers();
with(people)
{
var str = "姓名: " + name + "<br>";
str += "年龄：" + age + "<br>";
str += "性别：" + gender;
document.write(str);
}
//-->
</script>