blocks|key|85766|text|您需要认识到的第一件事是，错误页面与任何其他页面没有什么不同。了解了这一点，您可以从示例中发回错误响应：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|85767|var+animals+=+{
++pig:+"Oink",
++cow:+"Moo",
++dog:+"Woof",
++human:+"Hello"
};

app.get("/speak/:animal",+function(req,+res)+{
++var+animal+=+req.params.animal;
++var+sound+=+animals[animal];
++if+(!sound)+{+//+Check+if+sound+got+set+to+a+truthy+value
++++res.status(404).send("Sorry+ERROR+404");+//+Note+call+to+`status`+to+send+actual+404
++++return;+//+Stop+function+execution+without+trying+to+send+sound
++}

++//+We+will+only+get+here+if+we+didn't+`return`+earlier
++res.send("The+"%2Banimal%2B"+says+"%2Bsound);
});

app.get("*",+function(req,+res)+{
++res.status(404).send("Sorry+ERROR+404");
});|code-block|syntax|javascript|85768|现在，我们不想在多个地方重复该错误消息。如果我们添加更多类似的路由，然后决定更改错误页面的外观，该怎么办？我们必须在很多不同的地方改变它。为了清理这一点，我们可以添加一个函数来为我们发送错误响应，这样我们就只在一个地方定义了消息。|85769|var+animals+=+{
++pig:+"Oink",
++cow:+"Moo",
++dog:+"Woof",
++human:+"Hello"
};

function+notFound(req,+res)+{
++res.status(404).send("Sorry+ERROR+404");
}

app.get("/speak/:animal",+function(req,+res)+{
++var+animal+=+req.params.animal;
++var+sound+=+animals[animal];
++if+(!sound)+{+//+Check+if+sound+got+set+to+a+truthy+value
++++notFound(req,+res);+//+send+the+error+message
++++return;+//+Stop+function+execution+without+trying+to+send+sound
++}

++//+We+will+only+get+here+if+we+didn't+`return`+earlier
++res.send("The+"%2Banimal%2B"+says+"%2Bsound);
});

app.get("*",+notFound);

//+The+line+above+is+a+more+concise+way+of+writing:
//+app.get("*",+function(req,+res)+{
//+++notFound(req,+res);
//+});|85770|85771|免责声明，这些代码都没有经过测试，尽管我对它进行了校对，但它可能会被破坏。|blockquote|85772|85773|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|W|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|Q|$]]

The first thing you need to recognize is that an error page is no different than any other page. Knowing this, you can send back the error response from within your example:

<pre><code>var animals = {
 pig: "Oink",
 cow: "Moo",
 dog: "Woof",
 human: "Hello"
};

app.get("/speak/:animal", function(req, res) {
 var animal = req.params.animal;
 var sound = animals[animal];
 if (!sound) { // Check if sound got set to a truthy value
 res.status(404).send("Sorry ERROR 404"); // Note call to `status` to send actual 404
 return; // Stop function execution without trying to send sound
 }

 // We will only get here if we didn't `return` earlier
 res.send("The "+animal+" says "+sound);
});

app.get("*", function(req, res) {
 res.status(404).send("Sorry ERROR 404");
});
</code></pre>

Now we don't want to be repeating that error message in multiple places. What if we add a bunch more similar routes and then decide we want to change what the error page looks like? We'll have to change it many different places. To clean this up, we can add a function that sends an error response for us so that we only define the message in one spot.

<pre><code>var animals = {
 pig: "Oink",
 cow: "Moo",
 dog: "Woof",
 human: "Hello"
};

function notFound(req, res) {
 res.status(404).send("Sorry ERROR 404");
}

app.get("/speak/:animal", function(req, res) {
 var animal = req.params.animal;
 var sound = animals[animal];
 if (!sound) { // Check if sound got set to a truthy value
 notFound(req, res); // send the error message
 return; // Stop function execution without trying to send sound
 }

 // We will only get here if we didn't `return` earlier
 res.send("The "+animal+" says "+sound);
});

app.get("*", notFound);

// The line above is a more concise way of writing:
// app.get("*", function(req, res) {
// notFound(req, res);
// });
</code></pre>

<blockquote>
 Disclaimer, none of this code is tested and although I proof-read it, it could be broken. 
</blockquote>

My app works as follows:
for--> <code>/anyOtherRoute ---&gt;error page</code> 

But I want the following operation: for--> <code>/speak/goat(which is not in my database/objects) --&gt;error page</code> 

<pre><code>var animals={
 pig: "Oink",
 cow: "Moo",
 dog: "Woof"
};
app.get("/speak/:animal",function(req,res){
//HERE IT WILL CHECK IF THE ANIMAL IS AN OBJECT
//if not get request to the error page should be sent
 var animal=req.params.animal;
 var sound=animals[animal];
 res.send("The "+animal+" says "+sound);
});
</code></pre>

I tried sending the get request inside the get request of the /speak/:animal like
/speak/anything other than :animal from objects but it didn't work.

Error page refers to:

<pre><code>app.get("*",function(req,res){
 res.send("Sorry ERROR 404"); 
});
</code></pre>

How do I trigger a get request for error page here?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我的应用程序的工作方式如下: for--> /anyOtherRoute --->error page但是我想要执行以下操作: for--> /speak/goat(which is not in my database/objects) -->error pagevar animals={  pig: "Oink",...

如何在这里触发错误页面的get请求？-腾讯云开发者社区-腾讯云

问如何在这里触发错误页面的get请求？
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问如何在这里触发错误页面的get请求？
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