= array(); } $post['classname'] = 'post'; } function comment_format(&$post) { global $conf, $uid, $gid, $forumlist; if (empty($post)) return; $forum = $post['fid'] ? forum_read($post['fid']) : ''; $thread = well_thread_read_cache($post['tid']); if ($thread) { //$post['fid'] = $thread['fid']; $post['closed'] = $thread['closed']; $post['subject'] = $thread['subject']; $post['url'] = $thread['url']; } else { $post['closed'] = 0; $post['subject'] = lang('thread_not_exists'); $post['url'] = ''; } $post['create_date_fmt'] = humandate($post['create_date']); //$post['message'] = stripslashes(htmlspecialchars_decode($post['message'])); $user = user_read_cache($post['uid']); $post['username'] = array_value($user, 'username'); $post['user_avatar_url'] = array_value($user, 'avatar_url'); $post['user'] = $user ? user_safe_info($user) : user_guest(); isset($post['floor']) || $post['floor'] = 0; // 权限判断 $post['allowupdate'] = 2 == array_value($forum, 'comment', 0) && ($uid == $post['uid'] || forum_access_mod($post['fid'], $gid, 'allowupdate')); $post['allowdelete'] = group_access($gid, 'allowuserdelete') && $uid == $post['uid'] || forum_access_mod($post['fid'], $gid, 'allowdelete'); $post['user_url'] = url('user-' . $post['uid'] . ($post['uid'] ? '' : '-' . $post['pid'])); if ($post['files'] > 0) { list($attachlist, $imagelist, $filelist) = well_attach_find_by_pid($post['pid']); // 使用图床 评论使用图床,mysql会过多,写死链接到内容是减轻mysql的过多的方法 if (2 == $conf['attach_on']) { foreach ($imagelist as $key => $attach) { $url = $conf['upload_url'] . 'website_attach/' . $attach['filename']; // 替换成图床 $post['message'] = FALSE !== strpos($post['message'], $url) && $attach['image_url'] ? str_replace($url, $attach['image_url'], $post['message']) : $post['message']; } } $post['filelist'] = $filelist; } else { $post['filelist'] = array(); } $post['classname'] = 'post'; } function comment_format_message(&$val) { global $conf; if (empty($val)) return; // 使用云储存 if (1 == $conf['attach_on'] && 1 == $val['attach_on']) { $val['message'] = str_replace('="upload/', '="' . file_path($val['attach_on']), $val['message']); } elseif (2 == $conf['attach_on'] && 2 == $val['attach_on']) { // 使用图床 list($attachlist, $imagelist, $filelist) = well_attach_find_by_tid($val['tid']); foreach ($imagelist as $key => $attach) { $url = $conf['upload_url'] . 'website_attach/' . $attach['filename']; // 替换成图床 $val['message'] = FALSE !== strpos($val['message'], $url) && $attach['image_url'] ? str_replace($url, $attach['image_url'], $val['message']) : $val['message']; } } else { $val['message'] = str_replace('="upload/', '="' . file_path($val['attach_on']), $val['message']); } //$val['message'] = stripslashes(htmlspecialchars_decode($val['message'])); } // 把内容中使用了云储存的附件链接替换掉 function comment_message_replace_url($pid, $message) { global $conf; if (0 == $conf['attach_on']) { $message = FALSE !== strpos($message, '="../upload/') ? str_replace('="../upload/', '="upload/', $message) : $message; $message = FALSE !== strpos($message, '="/upload/') ? str_replace('="/upload/', '="upload/', $message) : $message; } elseif (1 == $conf['attach_on']) { // 使用云储存 $message = str_replace('="' . $conf['cloud_url'] . 'upload/', '="upload/', $message); } elseif (2 == $conf['attach_on']) { // 使用图床 评论使用图床,mysql会过多,写死链接到内容是减轻mysql的过多的方法 list($attachlist, $imagelist, $filelist) = well_attach_find_by_pid($pid); foreach ($imagelist as $key => $attach) { $url = $conf['upload_url'] . 'website_attach/' . $attach['filename']; // 替换回相对链接 $message = $attach['image_url'] && FALSE !== strpos($message, $attach['image_url']) ? str_replace($attach['image_url'], $url, $message) : $message; } } return $message; } function comment_filter($val) { unset($val['userip']); return $val; } function comment_highlight_keyword($str, $k) { $r = str_ireplace($k, '' . $k . '', $str); return $r; } // //
function comment_message_format(&$s) { if (xn_strlen($s) < 100) return; $s = preg_replace('#.*?
#is', '', $s); $s = str_ireplace(array('
', '
', '
', '

', '', '', '', '' . ''), "\r\n", $s); $s = str_ireplace(array(' '), " ", $s); $s = strip_tags($s); $s = preg_replace('#[\r\n]+#', "\n", $s); $s = xn_substr(trim($s), 0, 100); $s = str_replace("\n", '
', $s); } // 对内容进行引用 function comment_quote($quotepid) { $quotepost = comment_read($quotepid); if (empty($quotepost)) return ''; $uid = $quotepost['uid']; $s = $quotepost['message']; $s = comment_brief($s, 100); $userhref = url('user-' . $uid); $user = user_read_cache($uid); $r = '
' . $user['username'] . ' ' . $s . '
'; return $r; } // 获取内容的简介 0: html, 1: txt; 2: markdown; 3: ubb function comment_brief($s, $len = 100) { $s = strip_tags($s); $s = htmlspecialchars($s); $more = xn_strlen($s) > $len ? ' ... ' : ''; $s = xn_substr($s, 0, $len) . $more; return $s; } ?>JS中 bind, call, apply 使用
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JS中 bind, call, apply 使用

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JS中 bind, call, apply 使用

JS中 bind, call, apply 使用

在JavaScript中,callbindapply 是用于改变函数上下文(函数的执行环境)的方法。它们的作用有所不同,下面分别给出它们的实例用法:

1. call 方法:

call 方法用于调用一个函数,并且可以指定函数内部的 this 值,并且可以传递参数作为函数的参数。下面是一个示例:

javascriptCopy code
const person1 = {firstName: 'John',lastName: 'Doe',
};const person2 = {firstName: 'Jane',lastName: 'Smith',
};function greet(greeting) {console.log(`${greeting}, ${this.firstName} ${this.lastName}`);
}greet.call(person1, 'Hello'); // 输出: "Hello, John Doe"
greet.call(person2, 'Hi');    // 输出: "Hi, Jane Smith"

在上面的示例中,通过 call 方法,我们将 greet 函数的上下文从全局对象改变为 person1person2 对象,并且传递了一个额外的参数作为 greeting

2. bind 方法:

bind 方法用于创建一个新的函数,该函数与原函数具有相同的函数体,但可以预先指定函数内部的 this 值,并返回这个新函数。下面是一个示例:

javascriptCopy code
const person = {firstName: 'John',lastName: 'Doe',
};function greet(greeting) {console.log(`${greeting}, ${this.firstName} ${this.lastName}`);
}const greetPerson = greet.bind(person);
greetPerson('Hello'); // 输出: "Hello, John Doe"

在这个示例中,我们使用 bind 方法创建了一个新函数 greetPerson,它的 this 值已经绑定到了 person 对象上。

3. apply 方法:

apply 方法与 call 类似,但它接受一个参数数组作为函数的参数。下面是一个示例:

javascriptCopy code
const person = {firstName: 'John',lastName: 'Doe',
};function greet(greeting, punctuation) {console.log(`${greeting}, ${this.firstName} ${this.lastName}${punctuation}`);
}const args = ['Hello', '!!!'];
greet.apply(person, args); // 输出: "Hello, John Doe!!!"

在这个示例中,我们使用 apply 方法将 args 数组的元素作为参数传递给 greet 函数。与 call 不同,apply 接受参数数组,可以动态传递参数。

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