blocks|key|4466054|text|我认为没有直接访问的方法，因为您的地图设计需要查看数组的每个对象。也可以有多个条目。json中的法线贴图是一个对象，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4466055|{
+++'key1':'value1',
+++'key2':'value2',
+++'key3':'value3'
}|code-block|syntax|javascript|4466056|也许你有可能改变序列化？|4466057|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I think there is no way to access directly, because your map-design requires to take a look on each object of the array. It's also possible to have multiple entries. A normal map in json is an object and looks like: 

<pre><code>{
 'key1':'value1',
 'key2':'value2',
 'key3':'value3'
}
</code></pre>

Maybe it's possible for you to change the serialization?

blocks|key|4466084|text|如果您只想映射特定的键：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4466085|代码的主要问题是浏览整个notificationData数组，即使搜索到的对象在前面。|4466086|在ES6中，您将能够使用Array.prototype.find()来获取所需的特定对象。现在，您的for循环可能是最好的方法，但是当您有了所有的键时，您应该停止迭代，无论是通过向您的For添加一个条件还是通过使用break：|offset|length|style|CODE|4466087|for(
++++var+notifydata+=+0;
++++notifydata+<+notificationMockdata[notify].notificationData.length+&&+(angular.isUndefined($scope.notificationContent[notify].notificationData.origin)+%7C%7C+angular.isUndefined($scope.notificationContent[notify].notificationData.destination));
++++notifydata%2B%2B
)+{
++++if(notificationMockdata[notify].notificationData[notifydata].key+==+'origin')
++++++++$scope.notificationContent[notify].notificationData.origin+=+notificationMockdata[notify].notificationData[notifydata].value
++++else+if(notificationMockdata[notify].notificationData[notifydata].key+==+'destn')
++++++++$scope.notificationContent[notify].notificationData.destination+=+notificationMockdata[notify].notificationData[notifydata].value
}|code-block|syntax|javascript|4466088|或|4466089|for(var+notifydata+=+0;+notifydata+<+notificationMockdata[notify].notificationData.length;+notifydata%2B%2B)+{
++++if(notificationMockdata[notify].notificationData[notifydata].key+==+'origin')
++++++++$scope.notificationContent[notify].notificationData.origin+=+notificationMockdata[notify].notificationData[notifydata].value
++++else+if(notificationMockdata[notify].notificationData[notifydata].key+==+'destn')
++++++++$scope.notificationContent[notify].notificationData.destination+=+notificationMockdata[notify].notificationData[notifydata].value
++++if+(angular.isDefined($scope.notificationContent[notify].notificationData.origin)+&&+angular.isDefined($scope.notificationContent[notify].notificationData.destination))
++++++++break;
}|4466090|4466091|如果您想映射所有键：|4466092|您应该使用Array.protoype.map()或Array.prototype.forEach()来获得更干净的代码：|4466093|$scope.notificationContent[notify].notificationData+=+{}
notificationMockdata[notify].notificationData.forEach(function(data)+{
++$scope.notificationContent[notify].notificationData[data.key]+=+data.value;
});|4466094|entityMap^0|0|0|1E|3|2Z|5|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|13|8|@$F|14|G|15|H|I]|$F|16|G|17|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|18|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|19|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|1A|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1C|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|1D|8|@]|9|@]|A|$]]|$1|X|3|Y|5|L|7|1E|8|@]|9|@]|A|$M|N]]|$1|Z|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|10|$]]

If you only want to map specific keys :

The main problem with your code is that you browse the whole notificationData array even if the searched objects come first.

In ES6, you will be able to use Array.prototype.find() to get the specific objects you need. For now, your <code>for</code> loop probably is the best way, however you should stop iterating when you have all your keys, either by adding a condition to your for or by using <code>break</code> :

<pre><code>for(
 var notifydata = 0;
 notifydata &lt; notificationMockdata[notify].notificationData.length &amp;&amp; (angular.isUndefined($scope.notificationContent[notify].notificationData.origin) || angular.isUndefined($scope.notificationContent[notify].notificationData.destination));
 notifydata++
) {
 if(notificationMockdata[notify].notificationData[notifydata].key == 'origin')
 $scope.notificationContent[notify].notificationData.origin = notificationMockdata[notify].notificationData[notifydata].value
 else if(notificationMockdata[notify].notificationData[notifydata].key == 'destn')
 $scope.notificationContent[notify].notificationData.destination = notificationMockdata[notify].notificationData[notifydata].value
}
</code></pre>

or

<pre><code>for(var notifydata = 0; notifydata &lt; notificationMockdata[notify].notificationData.length; notifydata++) {
 if(notificationMockdata[notify].notificationData[notifydata].key == 'origin')
 $scope.notificationContent[notify].notificationData.origin = notificationMockdata[notify].notificationData[notifydata].value
 else if(notificationMockdata[notify].notificationData[notifydata].key == 'destn')
 $scope.notificationContent[notify].notificationData.destination = notificationMockdata[notify].notificationData[notifydata].value
 if (angular.isDefined($scope.notificationContent[notify].notificationData.origin) &amp;&amp; angular.isDefined($scope.notificationContent[notify].notificationData.destination))
 break;
}
</code></pre>

<hr>

If you want to map all keys :

you should use Array.protoype.map() or Array.prototype.forEach() for cleaner code : 

<pre><code>$scope.notificationContent[notify].notificationData = {}
notificationMockdata[notify].notificationData.forEach(function(data) {
 $scope.notificationContent[notify].notificationData[data.key] = data.value;
});
</code></pre>

I have this map returned as JSON 

<pre><code>"notificationData":[{"key":"origin","value":"ABC"},{"key":"destn","value":"XYZ"},{"key":"flt","value":"450"},{"key":"date","value":"10/14/2015"}]
</code></pre>

currently i have this logic in angular to fetch the value for each key - is there a better way to directly access each key?

<pre><code>for(var notifydata = 0; notifydata &lt; notificationMockdata[notify].notificationData.length; notifydata++)
{
 if(notificationMockdata[notify].notificationData[notifydata].key == 'origin')
 {
 $scope.notificationContent[notify].notificationData.origin = notificationMockdata[notify].notificationData[notifydata].value
 }
 else if(notificationMockdata[notify].notificationData[notifydata].key == 'destn')
 {
 $scope.notificationContent[notify].notificationData.destination = notificationMockdata[notify].notificationData[notifydata].value
 }
}
</code></pre>

Extracting the value from a Map given the key

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。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我将此地图作为JSON返回"notificationData":[{"key":"origin","value":"ABC"},{"key":"destn","value":"XYZ"},{"key":"flt","value":"450"},{"key":"date","value":"10/14/2015"}]目前...

问在给定键的情况下从Map中提取值
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在给定键的情况下从Map中提取值EN