s="token punctuation">;</span>
            <span class="token keyword">return</span> chain<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>newExchange<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>然后在�