$cache[$key] = empty($arr) ? NULL : $arr; return $cache[$key]; } // 门户 获取需要在频道显示的栏目主题数据 function portal_channel_thread($fid) { global $forumlist; if (empty($fid)) return NULL; $orderby = array('tid' => 1); $page = 1; // 遍历所有在频道显示内容的栏目 $category_forumlist = channel_category($fid); $arrlist = array(); $forum_tids = array(); $tidlist = array(); if ($category_forumlist) { foreach ($category_forumlist as &$_forum) { // 频道显示数据 $arrlist['list'][$_forum['fid']] = array( 'fid' => $_forum['fid'], 'name' => $_forum['name'], 'rank' => $_forum['rank'], 'type' => $_forum['type'], 'url' => $_forum['url'], 'channel_new' => $_forum['channel_new'], ); $forum_thread = thread_tid__find(array('fid' => $_forum['fid']), $orderby, $page, $_forum['channel_new'], 'tid', array('tid')); // 最新信息按栏目分组 foreach ($forum_thread as $key => $_thread) { $forum_tids[$key] = $_thread; } unset($forum_thread); } $tidlist += $forum_tids; } unset($category_forumlist); // 获取属性对应的tid集合 list($flaglist, $flagtids) = flag_thread_by_fid($fid); empty($flagtids) || $tidlist += $flagtids; unset($flagtids); // 频道置顶 $stickylist = sticky_list_thread($fid); empty($stickylist) || $tidlist += $stickylist; // 在这之前合并所有二维数组 tid值为键/array('tid值' => tid值) $tidarr = arrlist_values($tidlist, 'tid'); // 在这之前使用$tidarr = array_merge($tidarr, $arr)前合并所有一维数组 tid/array(1,2,3) if (empty($tidarr)) { $arrlist['list'] = isset($arrlist['list']) ? array_multisort_key($arrlist['list'], 'rank', FALSE, 'fid') : array(); return $arrlist; } $tidarr = array_unique($tidarr); $pagesize = count($tidarr); // 遍历获取的所有tid主题 $threadlist = well_thread_find_asc($tidarr, $pagesize); // 遍历时为升序，翻转为降序 $threadlist = array_reverse($threadlist); foreach ($threadlist as &$_thread) { // 各栏目最新内容 isset($forum_tids[$_thread['tid']]) AND $arrlist['list'][$_thread['fid']]['news'][$_thread['tid']] = $_thread; // 全站置顶内容 isset($stickylist[$_thread['tid']]) AND $arrlist['sticky'][$_thread['tid']] = $_thread; // 首页属性主题 if (!empty($flaglist)) { foreach ($flaglist as $key => $val) { if (isset($val['tids']) && in_array($_thread['tid'], $val['tids'])) { $arrlist['flaglist'][$key][array_search($_thread['tid'], $val['tids'])] = $_thread; ksort($arrlist['flaglist'][$key]); $arrlist['flag'][$_thread['tid']] = $_thread; } } } } unset($threadlist); if (isset($arrlist['sticky'])) { $i = 0; foreach ($arrlist['sticky'] as &$val) { ++$i; $val['i'] = $i; } } if (isset($arrlist['flag'])) { $i = 0; foreach ($arrlist['flag'] as &$val) { ++$i; $val['i'] = $i; } } if (isset($arrlist['flaglist'])) { foreach ($arrlist['flaglist'] as &$val) { $i = 0; foreach ($val as &$v) { ++$i; $v['i'] = $i; } } } isset($arrlist['list']) AND $arrlist['list'] = array_multisort_key($arrlist['list'], 'rank', FALSE, 'fid'); return $arrlist; } ?>javascript - Const must be initialized error in Microsoft Edge in for...of loop - Stack Overflow

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    javascript - Const must be initialized error in Microsoft Edge in for...of loop - Stack Overflow

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    I am using const with the new for of looping structure of JavaScript. It works fine in Chrome but in MS Edge the following code throws error:

    for(const a of [1, 2, 3])
    console.log(a);

    Error: Const must be initialized

    Again, works fine in chrome, edge throws error. I guess it expects const variable to have an initialization value but that's the entire job of the for isn't it?

    MDN says edge supports the loop so browser support isn't an issue.

    I am using const with the new for of looping structure of JavaScript. It works fine in Chrome but in MS Edge the following code throws error:

    for(const a of [1, 2, 3])
    console.log(a);

    Error: Const must be initialized

    Again, works fine in chrome, edge throws error. I guess it expects const variable to have an initialization value but that's the entire job of the for isn't it?

    MDN says edge supports the loop so browser support isn't an issue.

    • javascript
    • for-loop
    • microsoft-edge
    Share Improve this question asked Jun 13, 2016 at 21:47 AchsharAchshar 5,2438 gold badges42 silver badges72 bronze badges 3
    • It is perfectly valid ES2015 code, so I presume it's the browser that should be blamed. – zerkms Commented Jun 13, 2016 at 21:50
    • Yeah I guess it's an undocumented behavior. – Achshar Commented Jun 13, 2016 at 21:52
    • const is relatively new for JavaScript. I agree with zerkms. – Joshua Commented Jun 13, 2016 at 22:18
    Add a comment  | 

    1 Answer 1

    Reset to default 18

    According to https://kangax.github.io/compat-table/es6, "const in for-of loop iteration scope" is not supported in IE and not in Edge until version 14. It's the same with let btw. Basic for of loops, and basic const/let usage do work though. MDN is not the most accurate source for browser support.

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