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我正在使用此功能在註冊時檢查用戶名可用性，如果用戶名存在，提交按鈕將被禁用。我正在使用php腳本來檢查用戶名是否存在於數據庫中。該代碼完全在我的本地服務器，而是一個Godaddy的服務器上託管的時候，我得到了下面的錯誤，當我提交或當我嘗試導航到另一個頁面：使用jQuery檢查用戶名可用性
空的響應後，我無法訪問我的網站約一分鐘，然後就沒事了。
我嘗試了很多東西，比如在所有其他js文件之前調用jquery.js文件，但沒有任何適用於我的東西。
我不是很擅長jQuery和javascript。謝謝你的建議。
ERE是腳本和HTML表單：
function check_availability_username() {
var min_chars = 4;
var max_chars = 30;
var re = /^\w+$/;
var characters_error1 = 'Minimum amount of chars is 4';
var characters_error2 = 'Maximum amount of chars is 30';
var characters_error3 = 'Chars can be only letters, numbers and underscores!';
var checking_html = 'Checking...';
var username = $('#username').val();
$.post("check_username.php", {
username: username
},
function(result) {
if (result == 1) {
if ($('#username').val().length < min_chars) {
$('#username_availability_result').html(characters_error1);
$('input[name=submit]').attr('disabled', true);
} else if ($('#username').val().length > max_chars) {
$('#username_availability_result').html(characters_error2);
$('input[name=submit]').attr('disabled', true);
} else if (!re.test($('#username').val())) {
$('#username_availability_result').html(characters_error3);
$('input[name=submit]').attr('disabled', true);
} else {
$('#username_availability_result').html(username + ' is Available');
$('input[name=submit]').attr('disabled', false);
}
} else {
$('#username_availability_result').html(username + ' is not Available');
$('input[name=submit]').attr('disabled', true);
}
});
if (event.which == 13 || event.keyCode == 13) {
$.post("check_username.php", {
username: username
},
function(result) {
if (result == 0) {
$('#username_availability_result').html(username + ' is not Available');
$('input[name=submit]').attr('disabled', true);
}
});
}
$('#submit').click(function() {
$.post("check_username.php", {
username: username
},
function(result) {
if (result == 0) {
$('#username_availability_result').html(username + ' is not Available');
$('input[name=submit]').attr('disabled', true);
}
});
});
}<form id="login-id" action="suscribe-form.php" method="POST" onkeyup="return check_availability_username();">
<div class="form-group">
<label for="username">Username</label>
<input type="text" class="form-control button-or-space" name="username" id="username" value="" minlength="4" maxlength="25" required pattern="\w+">
<input type='hidden' id='check_username_availability' value='Check Availability'> <span id='username_availability_result' name='username_availability_result'></span>
</div>
<div class="form-group">
<label for="password1">Password</label>
<input type="password" class="form-control button-or-space" name="password1" id="password1" value="" minlength="8" maxlength="60" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}" onchange="form.password2.pattern = this.value;">
</div>
<div class="form-group">
<label for="password2">Confirm password</label>
<input type="password" class="form-control button-or-space" name="password2" value="" minlength="8" maxlength="60" required pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}">
</div>
<div class="form-group pull-right">
<input type="submit" name="submit" id="submit" value="Register" class="btn btn-success button-or-space">
</div>
</form>這裏是PHP腳本：
<?php
mysql_connect('localhost', 'root', '');
mysql_select_db('DB');
$username = mysql_real_escape_string($_POST['username']);
$result = mysql_query('select username from user where username = "'.$username.
'"');
if (mysql_num_rows($result) > 0) {
echo 0;
} else {
echo 1;
}
?>
您在控制檯中看到的錯誤是什麼？ – brk
以下是控制檯的內容：無法加載資源：net :: ERR_EMPTY_RESPONSE http://uwfdb.com/suscribe.php:1 GET http://uwfdb.com/suscribe.php net :: ERR_EMPTY_RESPONSE – abdenour