我有这个shouwbox脚本。 我想知道如何限制每个消息的字符，如70个字符。 我也想知道如何操作，你必须在发布的每封邮件之间等待3秒。
这是我的剧本。
的index.html
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>jQuery</title>
<style type="text/css">
#daddy-shoutbox {
padding: 5px;
background: #FFF;
color: #000;
width: 250px;
font-family: Arial,Helvetica,sans-serif;
font-size: 11px;
}
.shoutbox-list {
border-bottom: 1px solid #000;
padding: 5px;
display: none;
}
#daddy-shoutbox-list {
text-align: left;
margin: 0px auto;
}
#daddy-shoutbox-form {
text-align: left;
}
.shoutbox-list-time {
color: #000;
}
.shoutbox-list-nick {
margin-left: 5px;
font-weight: bold;
}
.shoutbox-list-message {
margin-left: 5px;
}
</style>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.form.js"></script>
</head>
<body>
<div id="daddy-shoutbox">
<table cellpadding="3" cellspacing="0">
<form id="daddy-shoutbox-form" action="demos/jquery-shoutbox/daddy-shoutbox.php?action=add" method="post">
<tr>
<td>
Name:
<input type="text" name="nickname" />
</td>
</tr>
<tr>
<td>
Message:
<input type="text" name="message" />
<br /> <br />
<input type="submit" value="Submit" />
<span id="daddy-shoutbox-response"></span>
</form>
</td>
</tr>
</table>
<hr size="1" noshade />
<div id="daddy-shoutbox-list"></div>
<br />
</div>
<script type="text/javascript">
var count = 0;
var files = 'demos/jquery-shoutbox/';
var lastTime = 0;
function prepare(response) {
var d = new Date();
count++;
d.setTime(response.time*1000);
var mytime = d.getHours()+':'+d.getMinutes()+':'+d.getSeconds();
var string = '<div class="shoutbox-list" id="list-'+count+'">'
+ '<span class="shoutbox-list-time">'+mytime+'</span>'
+ '<span class="shoutbox-list-nick">'+response.nickname+':</span>'
+ '<span class="shoutbox-list-message">'+response.message+'</span>'
+'</div>';
if (count > 11) { x = (count - 11); $('#list-' + x).fadeOut('slow'); x = document.getElementById('list-' + x); x.style.display = "none"; }
return string;
}
function success(response, status) {
if(status == 'success') {
lastTime = response.time;
$('#daddy-shoutbox-response').html('<img src="'+files+'images/accept.png" />');
$('#daddy-shoutbox-list').prepend(prepare(response));
$('input[@name=message]').attr('value', '').focus();
$('#list-'+count).fadeIn('slow');
timeoutID = setTimeout(refresh, 3000);
}
}
function validate(formData, jqForm, options) {
for (var i=0; i < formData.length; i++) {
if (!formData[i].value) {
alert('Please fill in all the fields');
$('input[@name='+formData[i].name+']').css('background', 'red');
return false;
}
}
$('#daddy-shoutbox-response').html('<img src="'+files+'images/loader.gif" />');
clearTimeout(timeoutID);
}
function refresh() {
$.getJSON(files+"daddy-shoutbox.php?action=view&time="+lastTime, function(json) {
if(json.length) {
for(i=0; i < json.length; i++) {
$('#daddy-shoutbox-list').prepend(prepare(json[i]));
$('#list-' + count).fadeIn('slow');
}
var j = i-1;
lastTime = json[j].time;
}
//alert(lastTime);
});
timeoutID = setTimeout(refresh, 3000);
}
// wait for the DOM to be loaded
$(document).ready(function() {
var options = {
dataType: 'json',
beforeSubmit: validate,
success: success
};
$('#daddy-shoutbox-form').ajaxForm(options);
timeoutID = setTimeout(refresh, 100);
});
</script>
</body>
</html>
爸爸-shoutbox.php
<?php
function replace(&$item, $key) {
$item = str_replace('|', '-', $item);
}
if (!function_exists('file_put_contents')) {
function file_put_contents($fileName, $data) {
if (is_array($data)) {
$data = join('', $data);
}
$res = @fopen($fileName, 'w+b');
if ($res) {
$write = @fwrite($res, $data);
if($write === false) {
return false;
} else {
return $write;
}
}
}
}
//file_put_contents('debug.txt', print_r($_GET, true));
switch($_GET['action']) {
case 'add':
array_walk($_POST, 'replace');
$arr = file('messages.txt');
if(count($arr) > 10)
array_shift($arr);
$_POST['nickname'] = htmlentities($_POST['nickname']);
$_POST['message'] = htmlentities($_POST['message']);
$time = time();
$arr[] = $time.'|'.$_POST['nickname'].'|'.$_POST['message'].'|'.$_SERVER['REMOTE_ADDR']."\n";
file_put_contents('messages.txt', implode('', $arr));
$data['response'] = 'Good work';
$data['nickname'] = $_POST['nickname'];
$data['message'] = $_POST['message'];
$data['time'] = $time;
break;
case 'view':
$data = array();
$arr = file('messages.txt');
if(!$_GET['time'])
$_GET['time'] = 0;
foreach($arr as $row) {
$aTemp = null;
list($aTemp['time'], $aTemp['nickname'], $aTemp['message']) = explode('|', $row);
if($aTemp['message'] AND $aTemp['time'] > $_GET['time'])
$data[] = $aTemp;
}
//file_put_contents('debug.txt', print_r($data, true));
break;
}
require_once('JSON.php');
$json = new Services_JSON();
$out = $json->encode($data);
print $out;
?>
JSON.php
<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* Converts to and from JSON format.
*
* JSON (JavaScript Object Notation) is a lightweight data-interchange
* format. It is easy for humans to read and write. It is easy for machines
* to parse and generate. It is based on a subset of the JavaScript
* Programming Language, Standard ECMA-262 3rd Edition - December 1999.
* This feature can also be found in Python. JSON is a text format that is
* completely language independent but uses conventions that are familiar
* to programmers of the C-family of languages, including C, C++, C#, Java,
* JavaScript, Perl, TCL, and many others. These properties make JSON an
* ideal data-interchange language.
*
* This package provides a simple encoder and decoder for JSON notation. It
* is intended for use with client-side Javascript applications that make
* use of HTTPRequest to perform server communication functions - data can
* be encoded into JSON notation for use in a client-side javascript, or
* decoded from incoming Javascript requests. JSON format is native to
* Javascript, and can be directly eval()'ed with no further parsing
* overhead
*
* All strings should be in ASCII or UTF-8 format!
*
* LICENSE: Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met: Redistributions of source code must retain the
* above copyright notice, this list of conditions and the following
* disclaimer. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* @category
* @package Services_JSON
* @author Michal Migurski <mike-json@teczno.com>
* @author Matt Knapp <mdknapp[at]gmail[dot]com>
* @author Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
* @copyright 2005 Michal Migurski
* @version CVS: $Id: JSON.php,v 1.31 2006/06/28 05:54:17 migurski Exp $
* @license http://www.opensource.org/licenses/bsd-license.php
* @link http://pear.php.net/pepr/pepr-proposal-show.php?id=198
*/
/**
* Marker constant for Services_JSON::decode(), used to flag stack state
*/
define('SERVICES_JSON_SLICE', 1);
/**
* Marker constant for Services_JSON::decode(), used to flag stack state
*/
define('SERVICES_JSON_IN_STR', 2);
/**
* Marker constant for Services_JSON::decode(), used to flag stack state
*/
define('SERVICES_JSON_IN_ARR', 3);
/**
* Marker constant for Services_JSON::decode(), used to flag stack state
*/
define('SERVICES_JSON_IN_OBJ', 4);
/**
* Marker constant for Services_JSON::decode(), used to flag stack state
*/
define('SERVICES_JSON_IN_CMT', 5);
/**
* Behavior switch for Services_JSON::decode()
*/
define('SERVICES_JSON_LOOSE_TYPE', 16);
/**
* Behavior switch for Services_JSON::decode()
*/
define('SERVICES_JSON_SUPPRESS_ERRORS', 32);
/**
* Converts to and from JSON format.
*
* Brief example of use:
*
* <code>
* // create a new instance of Services_JSON
* $json = new Services_JSON();
*
* // convert a complexe value to JSON notation, and send it to the browser
* $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
* $output = $json->encode($value);
*
* print($output);
* // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
*
* // accept incoming POST data, assumed to be in JSON notation
* $input = file_get_contents('php://input', 1000000);
* $value = $json->decode($input);
* </code>
*/
class Services_JSON
{
/**
* constructs a new JSON instance
*
* @param int $use object behavior flags; combine with boolean-OR
*
* possible values:
* - SERVICES_JSON_LOOSE_TYPE: loose typing.
* "{...}" syntax creates associative arrays
* instead of objects in decode().
* - SERVICES_JSON_SUPPRESS_ERRORS: error suppression.
* Values which can't be encoded (e.g. resources)
* appear as NULL instead of throwing errors.
* By default, a deeply-nested resource will
* bubble up with an error, so all return values
* from encode() should be checked with isError()
*/
function Services_JSON($use = 0)
{
$this->use = $use;
}
/**
* convert a string from one UTF-16 char to one UTF-8 char
*
* Normally should be handled by mb_convert_encoding, but
* provides a slower PHP-only method for installations
* that lack the multibye string extension.
*
* @param string $utf16 UTF-16 character
* @return string UTF-8 character
* @access private
*/
function utf162utf8($utf16)
{
// oh please oh please oh please oh please oh please
if(function_exists('mb_convert_encoding')) {
return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
}
$bytes = (ord($utf16{0}) << 8) | ord($utf16{1});
switch(true) {
case ((0x7F & $bytes) == $bytes):
// this case should never be reached, because we are in ASCII range
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0x7F & $bytes);
case (0x07FF & $bytes) == $bytes:
// return a 2-byte UTF-8 character
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0xC0 | (($bytes >> 6) & 0x1F))
. chr(0x80 | ($bytes & 0x3F));
case (0xFFFF & $bytes) == $bytes:
// return a 3-byte UTF-8 character
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0xE0 | (($bytes >> 12) & 0x0F))
. chr(0x80 | (($bytes >> 6) & 0x3F))
. chr(0x80 | ($bytes & 0x3F));
}
// ignoring UTF-32 for now, sorry
return '';
}
/**
* convert a string from one UTF-8 char to one UTF-16 char
*
* Normally should be handled by mb_convert_encoding, but
* provides a slower PHP-only method for installations
* that lack the multibye string extension.
*
* @param string $utf8 UTF-8 character
* @return string UTF-16 character
* @access private
*/
function utf82utf16($utf8)
{
// oh please oh please oh please oh please oh please
if(function_exists('mb_convert_encoding')) {
return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
}
switch(strlen($utf8)) {
case 1:
// this case should never be reached, because we are in ASCII range
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return $utf8;
case 2:
// return a UTF-16 character from a 2-byte UTF-8 char
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr(0x07 & (ord($utf8{0}) >> 2))
. chr((0xC0 & (ord($utf8{0}) << 6))
| (0x3F & ord($utf8{1})));
case 3:
// return a UTF-16 character from a 3-byte UTF-8 char
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
return chr((0xF0 & (ord($utf8{0}) << 4))
| (0x0F & (ord($utf8{1}) >> 2)))
. chr((0xC0 & (ord($utf8{1}) << 6))
| (0x7F & ord($utf8{2})));
}
// ignoring UTF-32 for now, sorry
return '';
}
/**
* encodes an arbitrary variable into JSON format
*
* @param mixed $var any number, boolean, string, array, or object to be encoded.
* see argument 1 to Services_JSON() above for array-parsing behavior.
* if var is a strng, note that encode() always expects it
* to be in ASCII or UTF-8 format!
*
* @return mixed JSON string representation of input var or an error if a problem occurs
* @access public
*/
function encode($var)
{
switch (gettype($var)) {
case 'boolean':
return $var ? 'true' : 'false';
case 'NULL':
return 'null';
case 'integer':
return (int) $var;
case 'double':
case 'float':
return (float) $var;
case 'string':
// STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
$ascii = '';
$strlen_var = strlen($var);
/*
* Iterate over every character in the string,
* escaping with a slash or encoding to UTF-8 where necessary
*/
for ($c = 0; $c < $strlen_var; ++$c) {
$ord_var_c = ord($var{$c});
switch (true) {
case $ord_var_c == 0x08:
$ascii .= '\b';
break;
case $ord_var_c == 0x09:
$ascii .= '\t';
break;
case $ord_var_c == 0x0A:
$ascii .= '\n';
break;
case $ord_var_c == 0x0C:
$ascii .= '\f';
break;
case $ord_var_c == 0x0D:
$ascii .= '\r';
break;
case $ord_var_c == 0x22:
case $ord_var_c == 0x2F:
case $ord_var_c == 0x5C:
// double quote, slash, slosh
$ascii .= '\\'.$var{$c};
break;
case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
// characters U-00000000 - U-0000007F (same as ASCII)
$ascii .= $var{$c};
break;
case (($ord_var_c & 0xE0) == 0xC0):
// characters U-00000080 - U-000007FF, mask 110XXXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c, ord($var{$c + 1}));
$c += 1;
$utf16 = $this->utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xF0) == 0xE0):
// characters U-00000800 - U-0000FFFF, mask 1110XXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}));
$c += 2;
$utf16 = $this->utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xF8) == 0xF0):
// characters U-00010000 - U-001FFFFF, mask 11110XXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}),
ord($var{$c + 3}));
$c += 3;
$utf16 = $this->utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xFC) == 0xF8):
// characters U-00200000 - U-03FFFFFF, mask 111110XX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}),
ord($var{$c + 3}),
ord($var{$c + 4}));
$c += 4;
$utf16 = $this->utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
case (($ord_var_c & 0xFE) == 0xFC):
// characters U-04000000 - U-7FFFFFFF, mask 1111110X
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$char = pack('C*', $ord_var_c,
ord($var{$c + 1}),
ord($var{$c + 2}),
ord($var{$c + 3}),
ord($var{$c + 4}),
ord($var{$c + 5}));
$c += 5;
$utf16 = $this->utf82utf16($char);
$ascii .= sprintf('\u%04s', bin2hex($utf16));
break;
}
}
return '"'.$ascii.'"';
case 'array':
/*
* As per JSON spec if any array key is not an integer
* we must treat the the whole array as an object. We
* also try to catch a sparsely populated associative
* array with numeric keys here because some JS engines
* will create an array with empty indexes up to
* max_index which can cause memory issues and because
* the keys, which may be relevant, will be remapped
* otherwise.
*
* As per the ECMA and JSON specification an object may
* have any string as a property. Unfortunately due to
* a hole in the ECMA specification if the key is a
* ECMA reserved word or starts with a digit the
* parameter is only accessible using ECMAScript's
* bracket notation.
*/
// treat as a JSON object
if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
$properties = array_map(array($this, 'name_value'),
array_keys($var),
array_values($var));
foreach($properties as $property) {
if(Services_JSON::isError($property)) {
return $property;
}
}
return '{' . join(',', $properties) . '}';
}
// treat it like a regular array
$elements = array_map(array($this, 'encode'), $var);
foreach($elements as $element) {
if(Services_JSON::isError($element)) {
return $element;
}
}
return '[' . join(',', $elements) . ']';
case 'object':
$vars = get_object_vars($var);
$properties = array_map(array($this, 'name_value'),
array_keys($vars),
array_values($vars));
foreach($properties as $property) {
if(Services_JSON::isError($property)) {
return $property;
}
}
return '{' . join(',', $properties) . '}';
default:
return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
? 'null'
: new Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
}
}
/**
* array-walking function for use in generating JSON-formatted name-value pairs
*
* @param string $name name of key to use
* @param mixed $value reference to an array element to be encoded
*
* @return string JSON-formatted name-value pair, like '"name":value'
* @access private
*/
function name_value($name, $value)
{
$encoded_value = $this->encode($value);
if(Services_JSON::isError($encoded_value)) {
return $encoded_value;
}
return $this->encode(strval($name)) . ':' . $encoded_value;
}
/**
* reduce a string by removing leading and trailing comments and whitespace
*
* @param $str string string value to strip of comments and whitespace
*
* @return string string value stripped of comments and whitespace
* @access private
*/
function reduce_string($str)
{
$str = preg_replace(array(
// eliminate single line comments in '// ...' form
'#^\s*//(.+)$#m',
// eliminate multi-line comments in '/* ... */' form, at start of string
'#^\s*/\*(.+)\*/#Us',
// eliminate multi-line comments in '/* ... */' form, at end of string
'#/\*(.+)\*/\s*$#Us'
), '', $str);
// eliminate extraneous space
return trim($str);
}
/**
* decodes a JSON string into appropriate variable
*
* @param string $str JSON-formatted string
*
* @return mixed number, boolean, string, array, or object
* corresponding to given JSON input string.
* See argument 1 to Services_JSON() above for object-output behavior.
* Note that decode() always returns strings
* in ASCII or UTF-8 format!
* @access public
*/
function decode($str)
{
$str = $this->reduce_string($str);
switch (strtolower($str)) {
case 'true':
return true;
case 'false':
return false;
case 'null':
return null;
default:
$m = array();
if (is_numeric($str)) {
// Lookie-loo, it's a number
// This would work on its own, but I'm trying to be
// good about returning integers where appropriate:
// return (float)$str;
// Return float or int, as appropriate
return ((float)$str == (integer)$str)
? (integer)$str
: (float)$str;
} elseif (pre
答案 0 :(得分：0)
您可以在客户端强制执行这些限制以实现速度目的，但需要在服务器端应用这些限制。否则，有人可以下载您的表单，删除限制，并无限制地使用它。您已经向我们提供了客户端代码，因此我们无法帮助您完成您所提供的内容。
如果您的网站没有采用某种登录系统，可能应该这样做。这是识别谁在做什么的最佳方式（因此，如果他们正在做垃圾邮件，你可以让他们停止）。
答案 1 :(得分：0)
要限制客户端的字符数，我相信<input type="text" maxlength="70"＆gt;应该工作。
您需要使用substr（）强制执行限制服务器端。否则它将非常容易规避。 例如。 $ message = substr（$ _ REQUEST ['message']，0,70）;
看到3秒不是非常长的时间，你可以这样做，因此页面加载需要3秒。不是一个优雅的解决方案，很容易被任何黑客绕过，但它是一个开始。把它放在你的文件的开头：
<?php
sleep(3);
?＆GT;