Question

我查看了以下代码：

  app.use(methodOverride(function (req, res) {
    if (req.body && typeof req.body === 'object' && '_method' in req.body) {
      // look in urlencoded POST bodies and delete it
      var method = req.body._method;
      delete req.body._method;
      return method;
    }
  }));

在node-express-mongoose-demo存储库中，只是感兴趣的是做什么的？有人可以解释一下吗？

Answer 1

来自官方文件：

Method Override允许您使用PUT和DELETE http方法。在这种情况下，您的应用程序会查找POST查询的_method参数，如果找到它，则会覆盖POST请求以进行“删除”，并从正文中删除该参数。在实践中，您可以在客户端上使用它：

<form method="POST" action="/resource" enctype="application/x-www-form-urlencoded">
  <input type="hidden" name="_method" value="DELETE">
  <button type="submit">Delete resource</button>
</form>

请注意隐藏的输入_method，它将触发您的中间件功能。

一步一步：

if (req.body && typeof req.body === 'object' && '_method' in req.body) { //If we have a body, and it contains a _method field

  var method = req.body._method; // Override the POST method with the value of the _method field (eg:DELETE in our example)
  delete req.body._method; //remove the field from the body, we don't need it anymore
  return method;
} //And our POST request is now a DELETE!

nodeOverride在node-express-mongoose-demo存储库中的含义是什么？

1 个答案: