<p><span class="ql-size-large" style="color:rgb(77, 77, 77);">多字段</span><a href="https://so.csdn.net/so/search?q=%E6%A8%A1%E7%B3%8A%E6%90%9C%E7%B4%A2&amp;spm=1001.2101.3001.7020" rel="noopener noreferrer" target="_blank" class="ql-size-large" style="color:rgb(252, 85, 49);">模糊搜索</a><span class="ql-size-large" style="color:rgb(77, 77, 77);">，比如数据有 书名和作者。最简单的搜索是搜索书名或作者的关键字，但是想同时</span></p><p><br></p><p><span class="ql-size-large" style="color:rgb(77, 77, 77);">搜索书名和作者怎么办呢，这里用到了mongoose的操作符$all</span></p><p><br></p><p><span class="ql-size-large" style="color:rgb(77, 77, 77);">这里key是</span><a href="https://so.csdn.net/so/search?q=%E6%90%9C%E7%B4%A2%E6%A1%86&amp;spm=1001.2101.3001.7020" rel="noopener noreferrer" target="_blank" class="ql-size-large" style="color:rgb(252, 85, 49);">搜索框</a><span class="ql-size-large" style="color:rgb(77, 77, 77);">中的值，多条件搜索时以空格分隔，keys是存储了关键字段值得数组key进来后先</span></p><p><br></p><p><span class="ql-size-large" style="color:rgb(77, 77, 77);">用</span><a href="https://so.csdn.net/so/search?q=split&amp;spm=1001.2101.3001.7020" rel="noopener noreferrer" target="_blank" class="ql-size-large" style="color:rgb(252, 85, 49);">split</a><span class="ql-size-large" style="color:rgb(77, 77, 77);">（）已空格分隔成数组，数组里每个值都对应一个条件，有几个值就循环几次 把条件push进</span></p><p><br></p><p><span class="ql-size-large" style="color:rgb(77, 77, 77);">条件数组arrKey，然后给query.$and = arrKey，这样用qurey去查询就可以了</span></p><p><br></p><pre class="ql-syntax" spellcheck="false">&nbsp;if (params.key) { &nbsp;&nbsp;let arr = [] &nbsp;&nbsp;let arrKey = [] &nbsp;&nbsp;// key含空格则分割关键词进行搜索 &nbsp;&nbsp;if (params.key.indexOf(' ') !== -1) { &nbsp;&nbsp;&nbsp;arr = params.key.split(' ') &nbsp;&nbsp;&nbsp;arr.forEach(akey =&gt; { &nbsp;&nbsp;&nbsp;&nbsp;arrKey.push({ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;keys: { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$regex: akey, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$options: 'gi' &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;}) &nbsp;&nbsp;&nbsp;}) &nbsp;&nbsp;} else { &nbsp;&nbsp;&nbsp;arrKey = [{ &nbsp;&nbsp;&nbsp;&nbsp;keys: { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$regex: params.key, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$options: 'gi' &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;}] &nbsp;&nbsp;} &nbsp;query.$and = arrKey &nbsp;} </pre><p><br></p><p><span class="ql-size-large">最后根据query查询数据：</span></p><p><br></p><p><span class="ql-size-large">let book = await Book.find(query)</span></p><p><br></p>