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<span id="zrem"></span><h1>ZREM key member [member …]<a class="headerlink" href="#zrem-key-member-member" title="Permalink to this headline">¶</a></h1>
<blockquote>
<div><div class="line-block">
<div class="line">可用版本： >= 1.2.0</div>
<div class="line">时间复杂度: O(M*log(N))， <code class="docutils literal notranslate"><span class="pre">N</span></code> 为有序集的基数， <code class="docutils literal notranslate"><span class="pre">M</span></code> 为被成功移除的成员的数量。</div>
</div>
</div></blockquote>
<p>移除有序集 <code class="docutils literal notranslate"><span class="pre">key</span></code> 中的一个或多个成员，不存在的成员将被忽略。</p>
<p>当 <code class="docutils literal notranslate"><span class="pre">key</span></code> 存在但不是有序集类型时，返回一个错误。</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>在 Redis 2.4 版本以前， <a class="reference internal" href="#zrem">ZREM</a> 每次只能删除一个元素。</p>
</div>
<div class="section" id="id1">
<h2>返回值<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h2>
<p>被成功移除的成员的数量，不包括被忽略的成员。</p>
</div>
<div class="section" id="id2">
<h2>代码示例<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># 测试数据</span>
<span class="n">redis</span><span class="o">></span> <span class="n">ZRANGE</span> <span class="n">page_rank</span> <span class="mi">0</span> <span class="o">-</span><span class="mi">1</span> <span class="n">WITHSCORES</span>
<span class="mi">1</span><span class="p">)</span> <span class="s2">"bing.com"</span>
<span class="mi">2</span><span class="p">)</span> <span class="s2">"8"</span>
<span class="mi">3</span><span class="p">)</span> <span class="s2">"baidu.com"</span>
<span class="mi">4</span><span class="p">)</span> <span class="s2">"9"</span>
<span class="mi">5</span><span class="p">)</span> <span class="s2">"google.com"</span>
<span class="mi">6</span><span class="p">)</span> <span class="s2">"10"</span>
<span class="c1"># 移除单个元素</span>
<span class="n">redis</span><span class="o">></span> <span class="n">ZREM</span> <span class="n">page_rank</span> <span class="n">google</span><span class="o">.</span><span class="n">com</span>
<span class="p">(</span><span class="n">integer</span><span class="p">)</span> <span class="mi">1</span>
<span class="n">redis</span><span class="o">></span> <span class="n">ZRANGE</span> <span class="n">page_rank</span> <span class="mi">0</span> <span class="o">-</span><span class="mi">1</span> <span class="n">WITHSCORES</span>
<span class="mi">1</span><span class="p">)</span> <span class="s2">"bing.com"</span>
<span class="mi">2</span><span class="p">)</span> <span class="s2">"8"</span>
<span class="mi">3</span><span class="p">)</span> <span class="s2">"baidu.com"</span>
<span class="mi">4</span><span class="p">)</span> <span class="s2">"9"</span>
<span class="c1"># 移除多个元素</span>
<span class="n">redis</span><span class="o">></span> <span class="n">ZREM</span> <span class="n">page_rank</span> <span class="n">baidu</span><span class="o">.</span><span class="n">com</span> <span class="n">bing</span><span class="o">.</span><span class="n">com</span>
<span class="p">(</span><span class="n">integer</span><span class="p">)</span> <span class="mi">2</span>
<span class="n">redis</span><span class="o">></span> <span class="n">ZRANGE</span> <span class="n">page_rank</span> <span class="mi">0</span> <span class="o">-</span><span class="mi">1</span> <span class="n">WITHSCORES</span>
<span class="p">(</span><span class="n">empty</span> <span class="nb">list</span> <span class="ow">or</span> <span class="nb">set</span><span class="p">)</span>
<span class="c1"># 移除不存在元素</span>
<span class="n">redis</span><span class="o">></span> <span class="n">ZREM</span> <span class="n">page_rank</span> <span class="n">non</span><span class="o">-</span><span class="n">exists</span><span class="o">-</span><span class="n">element</span>
<span class="p">(</span><span class="n">integer</span><span class="p">)</span> <span class="mi">0</span>
</pre></div>
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