javascript文本对象

1、获取浏览器的对象属性

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>获取浏览器的对象属性</title>

</head>

<body>

with (document) {

write("你的浏览器信息:<ol>");

write("<li>代码：" + navigator.appCodeName); //浏览器的代码

write("<li>名称：" + navigator.appName); //浏览器的名称

write("<li>版本: " + navigator.appVersion);

write("<li>语言：" + naviagtor.language);

write("<li>编译平台：" + navigator.platform);

write("<li>用户表头: " + navigator.userAgent);

}

</script>

</body>

</html>

2、设置背景和字体的颜色

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>设置背景和字体的颜色</title>

body {

text-align:center;

}

</style>

document.bgColor = "black";

document.fgColor = "white";

function changeColor() {

document.bgColor = ""; //设置背景颜色

document.body.text = "blue"; //设置字体颜色

}

function outcolor() {

document.bgColor = "pink";

document.body.text = "white";

}

</script>

</head>

<body>

<p onMouseOver = "changeColor()" onMouseOut = "outcolor()">床前明月光，</p>

<p onMouseOver = "changeColor()" onMouseOut = "outcolor()">疑似地上霜。</p>

<p onMouseOver = "changeColor()" onMouseOut = "outcolor()">举头望明月，</p>

<p onMouseOver = "changeColor()" onMouseOut = "outcolor()">低头思故乡。</p>

</body>

</html>

3、防盗链

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

<!--

var frontURL = document.referrer; //获取上次的连接地址

var host = location.hostname;

if ("" != frontURL) {

var frontHost = frontURL.subString(7, host.length + 7);

if (host == frontURL) {

alert("没有盗链！！");

} else {

alert("您是非法盗链，请通过本部访问！！");

}

} else {

alert("您是直接打开该文档，没有盗链！！");

}

-->

</script>

</body>

</html>

4、自动选择文本框的内容

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>自动选择文本框的内容</title>

function Selected() {

form1.text.focuse(); //取得文本框焦点

form1.text.select(); //选择文本框

}

function show() {

alert(form1.text.value);

}

</script>

</head>

<label>

</label>

</form>

</body>

</html>

这是个比较常用到的功能，帮客户自动选择文本框的内容减少客户的输入量！

5、表单验证

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>表单的验证</title>

function check() {

if (form1.username.value == "" || "" == form1.password.value || "" == form1.email.value) {

//alert(username);

var name = form1.username.value;

form1.username.value = "" + name;

alert("您的资料没有完善！！");

} else {

var str = form1.email.value;

var n = str.indexOf("@", 1); //简单地验证邮箱

if((n == -1) || (str.length - 1) == n) {

alert("您的Email地址不合法，请重新输入！！");

return false;

}

alert("验证成功！！！");

}

function Reset() {

var result = confirm("您确定要重置表单吗？？重置后已经填写的内容会没有了！！"); //人性化提示

return result;

}

</script>

</head>

<body>

用户名：<input type = "text" name = "username" id = "username"/><br />

密码：<input type = "password" name = "password" /><br />

邮箱：<input type = "text" name = "email" /><br />

</form>

</body>

</html>

上面是最简单的前台信息验证。