title: How to custom log format when use zap?
body: <p>Currently, our project's log format is like:</p>
  
  <pre><code>www.abcdef.com`3`1s
  </code></pre>
  
  <p>I want to use Go to rewrite project and import zap as log tool. By zap the log's format is like:</p>
  
  <pre><code>{"url": "www.abcdef.com", "attempt": 3, "backoff": "1s"}
  </code></pre>
  
  <p>I google its usage, but I don't find out any way that changes zap's format to above mentioned, so I want to seek some advice here.</p>