vbulletin_global.js

这是从网上下载下来的一个计算程序

// ensure SESSIONURL exists
if (typeof(SESSIONURL) == "undefined")
{
	var SESSIONURL = "";
}

// ensure vbphrase exists
if (typeof(vbphrase) == "undefined")
{
	var vbphrase = new Array();
}

// Array of message editor objects
var vB_Editor = new Array();

// Ignore characters within [quote] tags in messages for length check
var ignorequotechars = false;

// Number of pagenav items dealt with so far
var pagenavcounter = 0;

// #############################################################################
// Browser detection and limitation workarounds

// Define the browser we have instead of multiple calls throughout the file
var userAgent = navigator.userAgent.toLowerCase();
var is_opera  = ((userAgent.indexOf('opera') != -1) || (typeof(window.opera) != 'undefined'));
var is_saf    = ((userAgent.indexOf('applewebkit') != -1) || (navigator.vendor == 'Apple Computer, Inc.'));
var is_webtv  = (userAgent.indexOf('webtv') != -1);
var is_ie     = ((userAgent.indexOf('msie') != -1) && (!is_opera) && (!is_saf) && (!is_webtv));
var is_ie4    = ((is_ie) && (userAgent.indexOf('msie 4.') != -1));
var is_ie7    = ((is_ie) && (userAgent.indexOf('msie 7.') != -1));
var is_moz    = ((navigator.product == 'Gecko') && (!is_saf));
var is_kon    = (userAgent.indexOf('konqueror') != -1);
var is_ns     = ((userAgent.indexOf('compatible') == -1) && (userAgent.indexOf('mozilla') != -1) && (!is_opera) && (!is_webtv) && (!is_saf));
var is_ns4    = ((is_ns) && (parseInt(navigator.appVersion) == 4));
var is_mac    = (userAgent.indexOf('mac') != -1);

// Catch possible bugs with WebTV and other older browsers
var is_regexp = (window.RegExp) ? true : false;

// Is the visiting browser compatible with AJAX?
var AJAX_Compatible = false;

// Help out old versions of IE that don't understand element.style.cursor = 'pointer'
var pointer_cursor = (is_ie ? 'hand' : 'pointer');

/**
* Workaround for heinous IE bug - add special vBlength property to all strings
* This method is applied to ALL string objects automatically
*
* @return	integer
*/
String.prototype.vBlength = function()
{
	return (is_ie && this.indexOf('\n') != -1) ? this.replace(/\r?\n/g, '_').length : this.length;
}

if ('1234'.substr(-2, 2) == '12') // (which would be incorrect)
{
	String.prototype.substr_orig = String.prototype.substr;

	/**
	* Overrides IE's original String.prototype.substr to accept negative values
	*
	* @param	integer	Substring start position
	* @param	integer	Substring length
	*
	* @return	string
	*/
	String.prototype.substr = function(start, length)
	{
		return this.substr_orig( (start < 0 ? this.length + start : start), length);
	};
}

/**
* Pop function for browsers that don't have it built in
*
* @param	array	Array from which to pop
*
* @return	mixed	null on empty, value on success
*/
function array_pop(a)
{
	if (typeof a != 'object' || !a.length)
	{
		return null;
	}
	else
	{
		var response = a[a.length - 1];
		a.length--;
		return response;
	}
}

if (typeof Array.prototype.shift === 'undefined')
{
	Array.prototype.shift = function()
	{
		for(var i = 0, b = this[0], l = this.length-1; i < l; i++)
		{
			this[i] = this[i + 1];
		}
		this.length--;
		return b;
	};
}

/**
* Push function for browsers that don't have it built in
*
* @param	array	Array onto which to push
* @param	mixed	Value(s) to push onto - you may use multiple arguments here, eg: array_push(myArray, 1, 2, 3, 4, ...)
*
* @return	integer	Length of array
*/
function array_push(a, values)
{
	for (var i = 1; i < arguments.length; i++)
	{
		a[a.length] = arguments[i];
	}
	return a.length;
}

/**
* Function to emulate document.getElementById
*
* @param	string	Object ID
*
* @return	mixed	null if not found, object if found
*/
function fetch_object(idname)
{
	if (document.getElementById)
	{
		return document.getElementById(idname);
	}
	else if (document.all)
	{
		return document.all[idname];
	}
	else if (document.layers)
	{
		return document.layers[idname];
	}
	else
	{
		return null;
	}
}

/**
* Function to emulate document.getElementsByTagName
*
* @param	object	Parent object (eg: document)
* @param	string	Tag type (eg: 'td')
*
* @return	array
*/
function fetch_tags(parentobj, tag)
{
	if (parentobj == null)
	{
		return new Array();
	}
	else if (typeof parentobj.getElementsByTagName != 'undefined')
	{
		return parentobj.getElementsByTagName(tag);
	}
	else if (parentobj.all && parentobj.all.tags)
	{
		return parentobj.all.tags(tag);
	}
	else
	{
		return new Array();
	}
}

/**
* Function to count the number of tags in an object
*
* @param	object	Parent object (eg: document)
* @param	string	Tag type (eg: 'td')
*
* @return	integer
*/
function fetch_tag_count(parentobj, tag)
{
	return fetch_tags(parentobj, tag).length;
}



// #############################################################################
// Event handlers

/**
* Handles the different event models of different browsers and prevents event bubbling
*
* @param	event	Event object
*
* @return	event
*/
function do_an_e(eventobj)
{
	if (!eventobj || is_ie)
	{
		window.event.returnValue = false;
		window.event.cancelBubble = true;
		return window.event;
	}
	else
	{
		eventobj.stopPropagation();
		eventobj.preventDefault();
		return eventobj;
	}
}

/**
* Handles the different event models of different browsers and prevents event bubbling in a lesser way than do_an_e()
*
* @param	event	Event object
*
* @return	event
*/
function e_by_gum(eventobj)
{
	if (!eventobj || is_ie)
	{
		window.event.cancelBubble = true;
		return window.event;
	}
	else
	{
		if (eventobj.target.type == 'submit')
		{
			// naughty safari
			eventobj.target.form.submit();
		}
		eventobj.stopPropagation();
		return eventobj;
	}
}

// #############################################################################
// Message manipulation and validation

/**
* Checks that a message is valid for submission to PHP
*
* @param	string	Message text
* @param	mixed	Either subject text (if you want to make sure it exists) or 0 if you don't care
* @param	integer	Minimum acceptable character limit for the message
*
* @return	boolean
*/
function validatemessage(messagetext, subjecttext, minchars)
{
	if (is_kon || is_saf || is_webtv)
	{
		// ignore less-than-capable browsers
		return true;
	}
	else if (subjecttext.length < 1)
	{
		// subject not specified
		alert(vbphrase['must_enter_subject']);
		return false;
	}
	else
	{
		var stripped = PHP.trim(stripcode(messagetext, false, ignorequotechars));

		if (stripped.length < minchars)
		{
			// minimum message length not met
			alert(construct_phrase(vbphrase['message_too_short'], minchars));
			return false;
		}
		else if (typeof(document.forms.vbform) != 'undefined' && typeof(document.forms.vbform.imagestamp) != 'undefined')
		{			
			// This form has image verification enabled
			document.forms.vbform.imagestamp.failed = false;
			
			if (document.forms.vbform.imagestamp.value.length != 6)
			{
				alert(vbphrase['complete_image_verification']);
				document.forms.vbform.imagestamp.failed = true;
				document.forms.vbform.imagestamp.focus();
				return false;
			}
			else
			{
				return true;
			}
		}
		else
		{
			// everything seems ok
			return true;
		}
	}
}


/**
* Strips quotes and bbcode tags from text
*
* @param	string	Text to manipulate
* @param	boolean	If true, strip <x> otherwise strip [x]
* @param	boolean	If true, strip all [quote]...contents...[/quote]
*
* @return	string
*/
function stripcode(str, ishtml, stripquotes)
{
	if (!is_regexp)
	{
		return str;
	}

	if (stripquotes)
	{
		var start_time = new Date().getTime();

		while ((startindex = PHP.stripos(str, '[quote')) !== false)
		{
			if (new Date().getTime() - start_time > 2000)
			{
				// while loop has been running for over 2 seconds and has probably gone infinite
				break;
			}

			if ((stopindex = PHP.stripos(str, '[/quote]')) !== false)
			{
				fragment = str.substr(startindex, stopindex - startindex + 8);
				str = str.replace(fragment, '');
			}
			else
			{
				break;
			}
			str = PHP.trim(str);
		}
	}

	if (ishtml)
	{
		// exempt image tags -- they need to count as characters in the string
		// as the do as BB codes
		str = str.replace(/<img[^>]+src="([^"]+)"[^>]*>/gi, '$1');

		var html1 = new RegExp("<(\\w+)[^>]*>", 'gi');
		var html2 = new RegExp("<\\/\\w+>", 'gi');

		str = str.replace(html1, '');
		str = str.replace(html2, '');

		var html3 = new RegExp('(&nbsp;)', 'gi');
		str = str.replace(html3, ' ');
	}
	else
	{
		var bbcode1 = new RegExp("\\[(\\w+)[^\\]]*\\]", 'gi');
		var bbcode2 = new RegExp("\\[\\/(\\w+)\\]", 'gi');

		str = str.replace(bbcode1, '');
		str = str.replace(bbcode2, '');
	}

	return str;
}

// #############################################################################
// vB_PHP_Emulator class
// #############################################################################

/**
* PHP Function Emulator Class
*/
function vB_PHP_Emulator()
{
}

// =============================================================================
// vB_PHP_Emulator Methods

/**
* Find a string within a string (case insensitive)
*
* @param	string	Haystack
* @param	string	Needle
* @param	integer	Offset
*
* @return	mixed	Not found: false / Found: integer position
*/
vB_PHP_Emulator.prototype.stripos = function(haystack, needle, offset)
{
	if (typeof offset == 'undefined')
	{
		offset = 0;
	}

	index = haystack.toLowerCase().indexOf(needle.toLowerCase(), offset);

	return (index == -1 ? false : index);
}

/**
* Trims leading whitespace
*
* @param	string	String to trim
*
* @return	string
*/
vB_PHP_Emulator.prototype.ltrim = function(str)
{
	return str.replace(/^\s+/g, '');
}

/**
* Trims trailing whitespace
*
* @param	string	String to trim
*
* @return	string
*/
vB_PHP_Emulator.prototype.rtrim = function(str)
{
	return str.replace(/(\s+)$/g, '');
}

/**
* Trims leading and trailing whitespace
*
* @param	string	String to trim
*
* @return	string
*/
vB_PHP_Emulator.prototype.trim = function(str)
{
	return this.ltrim(this.rtrim(str));
}

/**
* Emulation of PHP's preg_quote()
*
* @param	string	String to process
*
* @return	string
*/
vB_PHP_Emulator.prototype.preg_quote = function(str)
{
	// replace + { } ( ) [ ] | / ? ^ $ \ . = ! < > : * with backslash+character
	return str.replace(/(\+|\{|\}|\(|\)|\[|\]|\||\/|\?|\^|\$|\\|\.|\=|\!|\<|\>|\:|\*)/g, "\\$1");
}

/**
* Emulates PHP's preg_match_all()... sort of
*
* @param	string	Haystack
* @param	string	Regular expression - to be inserted into RegExp(x)
*
* @return	mixed	Array on match, false on no match
*/
vB_PHP_Emulator.prototype.match_all = function(string, regex)
{
	var gmatch = string.match(RegExp(regex, "gim"));
	if (gmatch)
	{
		var matches = new Array();

		var iregex = new RegExp(regex, "im");
		for (var i = 0; i < gmatch.length; i++)
		{
			matches[matches.length] = gmatch[i].match(iregex);
		}

		return matches;
	}
	else
	{
		return false;
	}
}

/**
* Emulates unhtmlspecialchars in vBulletin
*
* @param	string	String to process
*
* @return	string
*/
vB_PHP_Emulator.prototype.unhtmlspecialchars = function(str)
{
	f = new Array(/&lt;/g, /&gt;/g, /&quot;/g, /&amp;/g);
	r = new Array('<', '>', '"', '&');

	for (var i in f)
	{
		str = str.replace(f[i], r[i]);
	}

	return str;
}

/**
* Unescape CDATA from vB_AJAX_XML_Builder PHP class
*
* @param	string	Escaped CDATA
*
* @return	string
*/
vB_PHP_Emulator.prototype.unescape_cdata = function(str)
{
	var r1 = /<\=\!\=\[\=C\=D\=A\=T\=A\=\[/g;
	var r2 = /\]\=\]\=>/g;

	return str.replace(r1, '<![CDATA[').replace(r2, ']]>');
}

/**
* Emulates PHP's htmlspecialchars()
*
* @param	string	String to process
*
* @return	string
*/
vB_PHP_Emulator.prototype.htmlspecialchars = function(str)
{
	//var f = new Array(/&(?!#[0-9]+;)/g, /</g, />/g, /"/g);
	var f = new Array(
		(is_mac && is_ie ? new RegExp('&', 'g') : new RegExp('&(?!#[0-9]+;)', 'g')),
		new RegExp('<', 'g'),
		new RegExp('>', 'g'),
		new RegExp('"', 'g')
	);
	var r = new Array(
		'&amp;',
		'&lt;',
		'&gt;',
		'&quot;'
	);

	for (var i = 0; i < f.length; i++)
	{
		str = str.replace(f[i], r[i]);
	}

	return str;
}

/**
* Searches an array for a value
*
* @param	string	Needle
* @param	array	Haystack
* @param	boolean	Case insensitive
*
* @return	integer	Not found: -1 / Found: integer index
*/
vB_PHP_Emulator.prototype.in_array = function(ineedle, haystack, caseinsensitive)
{
	var needle = new String(ineedle);

	if (caseinsensitive)
	{
		needle = needle.toLowerCase();
		for (var i in haystack)
		{
			if (haystack[i].toLowerCase() == needle)
			{
				return i;
			}
		}
	}
	else
	{
		for (var i in haystack)
		{
			if (haystack[i] == needle)
			{
				return i;
			}
		}
	}
	return -1;
}

/**
* Emulates PHP's strpad()
*
* @param	string	Text to pad
* @param	integer	Length to pad
* @param	string	String with which to pad
*
* @return	string
*/
vB_PHP_Emulator.prototype.str_pad = function(text, length, padstring)
{
	text = new String(text);
	padstring = new String(padstring);

	if (text.length < length)
	{
		padtext = new String(padstring);

		while (padtext.length < (length - text.length))
		{
			padtext += padstring;
		}

		text = padtext.substr(0, (length - text.length)) + text;
	}

	return text;
}

/**
* A sort of emulation of PHP's urlencode - not 100% the same, but accomplishes the same thing
*
* @param	string	String to encode
*
* @return	string
*/
vB_PHP_Emulator.prototype.urlencode = function(text)
{
	text = escape(text.toString()).replace(/\+/g, "%2B");

	// this escapes 128 - 255, as JS uses the unicode code points for them.
	// This causes problems with submitting text via AJAX with the UTF-8 charset.
	var matches = text.match(/(%([0-9A-F]{2}))/gi);
	if (matches)
	{
		for (var matchid = 0; matchid < matches.length; matchid++)
		{