blocks|key|3080312|text|它用于具有(subscribeFunction:+(state)+=>+void)+=>+()+=>+void;类型的名为subscribe的公共属性|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3080313|//+scope
public
//+name
subscribe:
//+type+(function)
++++//+parameters
++++(
++++++++//+parameter+name
++++++++subscribeFunction:
++++++++//+parameter+type+(function)
++++++++(state)+=>+void
++++)+=>+
++++//+return+type+(function)
++++()+=>+void;|code-block|syntax|javascript|3080314|下面是一个编译的例子：|3080315|class+MyClass+{
++++public+subscribe:+(subscribeFunction:+(state)+=>+void)+=>+()+=>+void;
}

let+myInstance+=+new+MyClass();

myInstance.subscribe+=+(subscribeFunction:+(state)+=>+void)+=>+{
++++console.log("statements+might+go+here");

++++return+()+=>+{
++++++++subscribeFunction(1+/*+state+*/);
++++++++console.log("nothing+returned+by+this+inner+function");
++++};
};

//+Example+use

//+outputs+"statements+might+go+here"
let+innerFunction+=+myInstance.subscribe((state)+=>+console.log(state));
//+outputs+1+and+"nothing+returned+by+this+inner+function"
innerFunction();|3080316|entityMap^0|5|1F|1P|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

It's for a public property called <code>subscribe</code> that has a type of <code>(subscribeFunction: (state) =&gt; void) =&gt; () =&gt; void;</code>:

<pre><code>// scope
public
// name
subscribe:
// type (function)
 // parameters
 (
 // parameter name
 subscribeFunction:
 // parameter type (function)
 (state) =&gt; void
 ) =&gt; 
 // return type (function)
 () =&gt; void;
</code></pre>

Here's an example that compiles:

<pre><code>class MyClass {
 public subscribe: (subscribeFunction: (state) =&gt; void) =&gt; () =&gt; void;
}

let myInstance = new MyClass();

myInstance.subscribe = (subscribeFunction: (state) =&gt; void) =&gt; {
 console.log("statements might go here");

 return () =&gt; {
 subscribeFunction(1 /* state */);
 console.log("nothing returned by this inner function");
 };
};

// Example use

// outputs "statements might go here"
let innerFunction = myInstance.subscribe((state) =&gt; console.log(state));
// outputs 1 and "nothing returned by this inner function"
innerFunction();
</code></pre>

blocks|key|5895816|text|注意第一个冒号--+subscribe是函数类型的公共属性，而不是方法。展开：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5895817|public+subscribe:+//+public+property,+which+is
++++(+//+of+the+type+of+a+function,+which+takes
++++++++subscribeFunction:+//+1+parameter,+which+itself+is
++++++++(state)+=>+void+//+a+function+of+1+parameter,+returning+nothing
++++)+=>+//+and+the+upon+invocation+of+a+function+stored+in+"subscribe"+it
++++++++()+=>+void;+//+returns+a+function+of+no+parameter+and+no+return+value|code-block|syntax|javascript|5895818|因此，您可以将一个函数存储到subscribe属性中，然后在为其提供一个函数作为参数的同时调用它，结果您将获得另一个函数，您可以随后调用该函数：|5895819|subscribe+=+(subscribeFunction:+(state)+=>+void)+=>+{
++++subscribeFunction('A');
++++return+()+=>+{console.log('C');};
};
let+subscribed+=+subscribe((state)+=>+{
++++console.log(state,+'B');
});+//+prints+'A,B'
subscribed();+//+prints+'C'|5895820|entityMap^0|A|9|0|0|E|9|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Notice the first colon -- <code>subscribe</code> is a public property of a function type, not a method. Unfolded:

<pre><code>public subscribe: // public property, which is
 ( // of the type of a function, which takes
 subscribeFunction: // 1 parameter, which itself is
 (state) =&gt; void // a function of 1 parameter, returning nothing
 ) =&gt; // and the upon invocation of a function stored in "subscribe" it
 () =&gt; void; // returns a function of no parameter and no return value
</code></pre>

Thus, you can store a function into the <code>subscribe</code> property, then call it while giving it a function as a parameter, and as a result you will get another function, which you can subsequently call:

<pre><code>subscribe = (subscribeFunction: (state) =&gt; void) =&gt; {
 subscribeFunction('A');
 return () =&gt; {console.log('C');};
};
let subscribed = subscribe((state) =&gt; {
 console.log(state, 'B');
}); // prints 'A,B'
subscribed(); // prints 'C'
</code></pre>

blocks|key|5873028|text|tx用于反馈，现在我理解了它，我认为最好的解释是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5873029|公共订阅：(subscribeFunction:(state)=>void)|5873030|//第一部分用于subscribeFunction，它将接受不返回任何内容的函数|5873031|=>()=>void；|5873032|//第二部分用于订阅本身，因为它将返回一个不返回任何内容的函数...我同意，像这样的代码应该更明确|5873033|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

tx for feedback, now that I understand it I think its best explained as:

public subscribe: (subscribeFunction:(state)=>void) 

// first potion is for subscribeFunction which will accept a function that does not return anything

=>()=>void;

// second potion is for the subscribe itself as it will return a function that does not return anything... and I agree, code like this should be more explicit

using TypeScript:
<pre><code>public subscribe:(subscribeFunction:(state)=&gt;void)=&gt;()=&gt;void;
</code></pre>
It's a subscribe method that gets function as an argument, of type function, and that function given, will receive a state argument when called, that argumented function will not return anything (i.e.: void) ... and I am lost on the last <code>()=&gt;()=&gt;void</code>.
Do I understand this right?

Can you explain this odd ES6 arrow function in TypeScript?

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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使用TypeScript：public subscribe:(subscribeFunction:(state)=>void)=>()=>void;这是一个订阅方法，它将函数作为参数获取，类型为function，且给定函数在被调用时将接收状态参数，带参数的函数不会返回任何内容(即: void) ...我迷失在最后一个(...

问你能解释一下TypeScript中这个奇怪的ES6箭头功能吗？
EN

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问你能解释一下TypeScript中这个奇怪的ES6箭头功能吗？EN