JavaScript 檢測瀏覽器和操作系統的腳本
2024-05-06 14:16:20
供稿：網友
Web編程中，識別用戶的瀏覽器以及操作系統非常重要。因為它們對HTML和JavaScript的支持程度有所不同。
一般應用在系統登陸頁面或者首頁中。
具體應用如下：
代碼如下:
<html>
<head>
<title>Login</title>
<script type="text/javascript" src="detect.js"></script>
<script type="text/javascript">
window.onload = function () {
if ((isMinIE5_5 && isWin) || (isMinMoz1 && isUnix)
|| (isMinSafari1 && isMac)) {
document.getElementById("divLogin").style.visibility = "visible";
document.getElementById("divError").style.visibility = "hidden"
}
};
</script>
</head>
<body>
<form method="post" action="DoLogin.jsp">
<div style="border: 2px dashed blue; background-color: #dedede; height: 300px; padding: 10px">
<div id="divError" style="position: absolute; left: 20px; top: 100px; ">
This Web application requires one of the following:
<ul>
<li>Internet Explorer 5.5 or higher for Windows</li>
<li>Mozilla 1.0 or higher for Unix</li>
<li>Safari 1.0 or higher for Macintosh</li>
</ul>
<noscript>
<p>This Web application also requires JavaScript (if you are using one of the above browsers, make sure that JavaScript is enabled).</p>
</noscript>
</div>
<div id="divLogin" style="position: absolute; left: 20px; top: 100px; visibility: hidden">
<table border="0" width="100%" height="100%"><tr><td align="center">
<table border="0">
<tr>
<td>Username:</td><td><input type="text" name="txtUsername" /></td>
</tr>
<tr>
<td>Password:</td><td><input type="password" name="txtPassword" /></td>
</tr>
<tr>
<td> </td><td><input type="Submit" value="Login" /></td>
</tr>
</table>
</td></tr></table>
</div>
</div>
</form>
</body>
</html>
detect.js
代碼如下:
/*************************************************************************
File Name: detect.js
Create Date:
Author:
Description: detect browser and operating system
***********************************************************************/
var sUserAgent = navigator.userAgent;
var fAppVersion = parseFloat(navigator.appVersion);
function compareVersions(sVersion1, sVersion2) {
var aVersion1 = sVersion1.split(".");
var aVersion2 = sVersion2.split(".");
if (aVersion1.length > aVersion2.length) {
for (var i=0; i < aVersion1.length - aVersion2.length; i++) {
aVersion2.push("0");
}
} else if (aVersion1.length < aVersion2.length) {
for (var i=0; i < aVersion2.length - aVersion1.length; i++) {
aVersion1.push("0");
