prototype.js对象属性

[jack3123]

大家好，我是新手，刚学prototype.js,请问：var Prototype = {
Version: '1.5.1',

Browser: {
IE: !!(window.attachEvent && !window.opera),
Opera: !!window.opera,
WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
Gecko: navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1
},

BrowserFeatures: {
XPath: !!document.evaluate,
ElementExtensions: !!window.HTMLElement,
SpecificElementExtensions:
(document.createElement('div').__proto__ !==
document.createElement('form').__proto__)
},

ScriptFragment: '<script[^>]*>([\u0001-\uFFFF]*?)</script>',
JSONFilter: /^\/\*-secure-\s*(.*)\s*\*\/\s*$/,

emptyFunction: function() { },
K: function(x) { return x }


}请问，<script src="prototype.js" type="text/javascript">

alert(Prototype.Version);


</script>

为什么无法显示：Version属性值。
请大侠指点小弟，谢谢。

[顾小林]

先F12看看有没有报错，