概述 jQuery.browser.version
返回值：String
描述：用户的浏览器渲染引擎的版本号。
以下是一些典型的结果：
请注意，IE8兼容性视要求成为ie 7。
示例
Returns the version number of the rendering engine used by the user's current browser. For example, FireFox 4 returns 2.0 (the version of the Gecko rendering engine it utilizes).
<!DOCTYPE html>
<html>
<head>
<style>
p { color:blue; margin:20px; }
span { color:red; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<p></p>
<script>
$("p").html( "The version number of the rendering engine your browser uses is: <span>" +
$.browser.version + "</span>" );
</script>
</body>
</html>
Alerts the version of IE's rendering engine that is being used:
if ( $.browser.msie ) {
alert( $.browser.version );
}
Often you only care about the "major number," the whole number, which you can get by using JavaScript's built-in parseInt() function:
if ( $.browser.msie ) {
alert( parseInt($.browser.version, 10) );
}