权限没有,则隐藏 function forum_list_access_filter($forumlist, $gid, $allow = 'allowread') { global $grouplist; if (empty($forumlist)) return array(); if (1 == $gid) return $forumlist; $forumlist_filter = $forumlist; $group = $grouplist[$gid]; foreach ($forumlist_filter as $fid => $forum) { if (empty($forum['accesson']) && empty($group[$allow]) || !empty($forum['accesson']) && empty($forum['accesslist'][$gid][$allow])) { unset($forumlist_filter[$fid]); } unset($forumlist_filter[$fid]['accesslist']); } return $forumlist_filter; } function forum_filter_moduid($moduids) { $moduids = trim($moduids); if (empty($moduids)) return ''; $arr = explode(',', $moduids); $r = array(); foreach ($arr as $_uid) { $_uid = intval($_uid); $_user = user_read($_uid); if (empty($_user)) continue; if ($_user['gid'] > 4) continue; $r[] = $_uid; } return implode(',', $r); } function forum_safe_info($forum) { //unset($forum['moduids']); return $forum; } function forum_filter($forumlist) { foreach ($forumlist as &$val) { unset($val['brief'], $val['announcement'], $val['seo_title'], $val['seo_keywords'], $val['create_date_fmt'], $val['icon_url'], $val['modlist']); } return $forumlist; } function forum_format_url($forum) { global $conf; if (0 == $forum['category']) { // 列表URL $url = url('list-' . $forum['fid'], '', FALSE); } elseif (1 == $forum['category']) { // 频道 $url = url('category-' . $forum['fid'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = url('read-' . trim($forum['brief']), '', FALSE); } if ($conf['url_rewrite_on'] > 1 && $forum['well_alias']) { if (0 == $forum['category'] || 1 == $forum['category']) { $url = url($forum['well_alias'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = ($forum['threads'] && $forum['brief']) ? url($forum['well_alias'] . '-' . trim($forum['brief']), '', FALSE) : url($forum['well_alias'], '', FALSE); } } return $url; } function well_forum_alias() { $forumlist = forum_list_cache(); if (empty($forumlist)) return ''; $key = 'forum-alias'; static $cache = array(); if (isset($cache[$key])) return $cache[$key]; $cache[$key] = array(); foreach ($forumlist as $val) { if ($val['well_alias']) $cache[$key][$val['fid']] = $val['well_alias']; } return array_flip($cache[$key]); } function well_forum_alias_cache() { global $conf; $key = 'forum-alias-cache'; static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存,跨进程需要再加一层缓存:redis/memcached/xcache/apc if (isset($cache[$key])) return $cache[$key]; if ('mysql' == $conf['cache']['type']) { $arr = well_forum_alias(); } else { $arr = cache_get($key); if (NULL === $arr) { $arr = well_forum_alias(); !empty($arr) AND cache_set($key, $arr); } } $cache[$key] = empty($arr) ? '' : $arr; return $cache[$key]; } ?>javascript - Get single yield value from iteratorgenerator - Stack Overflow
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javascript - Get single yield value from iteratorgenerator - Stack Overflow

programmeradmin6浏览0评论

I need entity that return incrementing integer after each call.

For example I have code.

var id = 0; //global variable =(

function foo() {
   ....
   console.log("Your unique ID is " + id++);
   ....
}

and it works fine. But I want to use generators for this work.

Something like:

function* getId() {
   var id = 0;
   while (true) {
       yield id++;
   }
}

 function foo() {
   ....
   console.log("Your unique ID is " + getId());
   ....
}

But result is only empty figure quotes. What i missed? Maybe using generators is a bad idea for this kind of generation?

I need entity that return incrementing integer after each call.

For example I have code.

var id = 0; //global variable =(

function foo() {
   ....
   console.log("Your unique ID is " + id++);
   ....
}

and it works fine. But I want to use generators for this work.

Something like:

function* getId() {
   var id = 0;
   while (true) {
       yield id++;
   }
}

 function foo() {
   ....
   console.log("Your unique ID is " + getId());
   ....
}

But result is only empty figure quotes. What i missed? Maybe using generators is a bad idea for this kind of generation?

Share Improve this question edited May 8, 2016 at 22:38 Bergi 666k161 gold badges1k silver badges1.5k bronze badges asked May 8, 2016 at 21:42 Stepan LoginovStepan Loginov 1,7675 gold badges24 silver badges55 bronze badges
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3 Answers 3

Reset to default 9

Your getId is a generator function that creates a generator, instead of advancing one and getting its values.
You should do something like

function* IdGenerator() {
    var i = 0;
    while (true) {
        yield i++;
    }
}
IdGenerator.prototype.get = function() {
    return this.next().value;
};

var ids = IdGenerator();
function foo() {
    …
    console.log("Your unique ID is " + ids.get());
    …
}

Here are the things I can tell are wrong:

  • you're resetting the id value on every function call.
  • for the generator to output the value of next iteration you need to generate the iterator, then you can access its next().value

Here's an example:

function* getId() {
 var id = 0;
    while (true) {
      yield id++;
    };
}

var itId = getId();

function foo() {
  console.log("Your unique ID is " + itId.next().value);
}

foo()
foo()

If you..

  • don't want to pollute your namespace
  • want short code

Then maybe an IIFE closing over the incremented variable will serve you better than a function* in this case

var getId = (function () {
    var i = 0;
    return () => i++;
}());

getId(); // 0
getId(); // 1
getId(); // 2
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