blocks|key|1347924|text|不要使用for(i=0;+i<size;+i%2B%2B)循环。相反，请使用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1347925|1347926|Object.keys(pins)获取属性列表，并通过它循环，或者|ordered-list-item|1347927|使用for+(+key_name+in+pins)与Object.hasOwnProperty+(排除继承属性)结合使用for+(+key_name+in+pins)来循环属性.|1347928|1347929|第三个测试用例的问题是它读取键0、1和2的值(而不是6、7、8)。|1347930|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys|1|https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/HasOwnProperty^0|4|L|0|0|0|H|0|H|0|0|2|N|Q|L|1O|N|Q|L|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|11|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|12|8|@$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]]|E|$]]|$1|J|3|K|5|I|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|L|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1J|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

<p>Don't use a <code>for(i=0; i&lt;size; i++)</code> loop. Instead, use:</p>

<ol>
<li><a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys" rel="noreferrer"><code>Object.keys(pins)</code></a> to get a list of properties, and loop through it, or</li>
<li>Use a <code>for ( key_name in pins)</code> in conjunction with <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/HasOwnProperty" rel="noreferrer"><code>Object.hasOwnProperty</code></a> (to exclude inherit properties) to loop through the properties.</li>
</ol>

<p>The problem of your third test case is that it reads the values of keys 0, 1 and 2 (instead of 6, 7, 8).</p>


blocks|key|1347937|text|pin从6开始到8，但是for循环循环从0到3(对象的长度)。您需要从6循环到6+%2B+the_size_of_the_object。就像这样：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1347938|for(var+i+=+6,+len+=+6+%2B+Object.size(pins);+i+<+len;+i%2B%2B)+{
++$('#result3').append('<div>'+%2B+pins[i]+%2B+'</div>');
}|code-block|syntax|javascript|1347939|1347940|或者像这样，这就是我喜欢的：|1347941|for(+var+i+=+5;+pin+=+pins[%2B%2Bi];+)+{
++$('#result3').append('<div>'+%2B+pin+%2B+'</div>');
}|1347942|entityMap^0|0|3|13|Q|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|W|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|X|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|Y|8|@]|D|@]|E|$]]|$1|N|3|O|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|P|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|Q|$]]

<p>The <code>pin</code> begins with 6 up to 8, but the for loop loops from 0 up to 3 (the length of the object). You need to loop from 6 up to <code>6 + the_size_of_the_object</code>. Something like this:</p>

<pre><code>for(var i = 6, len = 6 + Object.size(pins); i &lt; len; i++) {
  $('#result3').append('&lt;div&gt;' + pins[i] + '&lt;/div&gt;');
}
</code></pre>

<hr>

<p>Or something like this, this is what I like:</p>

<pre><code>for( var i = 5; pin = pins[++i]; ) {
  $('#result3').append('&lt;div&gt;' + pin + '&lt;/div&gt;');
}
</code></pre>


blocks|key|2196077|text|var+hash+=+{}
hash[key]+=+value

Object.keys(hash).forEach(function+(key)+{+
++++var+value+=+hash[key]
++++//+iteration+code
})|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2196078|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var hash = {}
hash[key] = value

Object.keys(hash).forEach(function (key) { 
    var value = hash[key]
    // iteration code
})
</code></pre>


blocks|key|1347953|text|由于您使用的是jQuery：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1347954|jQuery.each(pins,+function+(name,+value)+{
++++$('#result3').append('<div>'+%2B+name+%2B+"="+%2B+value+%2B+'</div>');
});|code-block|syntax|javascript|1347955|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Since you are using jQuery:</p>

<pre><code>jQuery.each(pins, function (name, value) {
    $('#result3').append('&lt;div&gt;' + name + "=" + value + '&lt;/div&gt;');
});
</code></pre>


blocks|key|1316326|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1316327|for+(var+pin+in+pins)+{
++++$('#result3').append('<div>'+%2B+pin+%2B+'</div>');
}|code-block|syntax|javascript|1316328|1316329|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|K|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|L|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|M|8|@]|9|@]|A|$]]]|I|$]]

<p>Try this:</p>

<pre><code>for (var pin in pins) {
    $('#result3').append('&lt;div&gt;' + pin + '&lt;/div&gt;');
}
</code></pre>

<p><a href="http://jsfiddle.net/7TrSU/1/" rel="nofollow"><strong>Example fiddle</strong></a></p>


blocks|key|1347969|text|function+iterate(obj){
++++var+keys+=+Object.keys(obj);
++++for(i+in+keys){
++++++++doSomething(obj[keys[i]].id);
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1347970|这在任何对象中的所有字段的id上迭代。|unstyled|offset|length|style|CODE|1347971|entityMap^0|0|D|2|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>function iterate(obj){
    var keys = Object.keys(obj);
    for(i in keys){
        doSomething(obj[keys[i]].id);
    }
}
</code></pre>

<p>This iterates over the <code>id</code> of all fields in any object</p>


<p>I am trying to use a hashtable so I can select a specific object stored in an array/object. However, I am having a problem looping through an object.</p>

<pre><code>var pins= {};
pins[6] = '6';
pins[7] = '7';
pins[8] = '8';

$('#result3').append('&lt;div&gt;Size: ' + Object.size(pins) + '&lt;/div&gt;');
for(var i = 0; i &lt; Object.size(pins); i++) {
    $('#result3').append('&lt;div&gt;' + pins[i] + '&lt;/div&gt;');
}
</code></pre>

<p><strong>JSFiddle</strong>: <a href="http://jsfiddle.net/7TrSU/" rel="noreferrer">http://jsfiddle.net/7TrSU/</a></p>

<p>As you can see in <code>TEST 3</code> which uses object <code>pin</code> to store the data, I am getting <code>undefined</code> when looping through the object <code>pin</code>. </p>

<p>What is the correct way for looping through <code>pin</code>?</p>

<p><strong>EDIT</strong></p>

<p>What happens if instead of just <code>pin[6] = '6'</code>, I make pin[6] = an object and I want to loop through the all their <code>id</code> properties? Actual code snippet of what I'm doing...</p>

<pre><code>for(var i = 0; i &lt; json.length; i++) {
    markerId = json[i].listing_id

    // Place markers on map
    var latLng = new google.maps.LatLng(json[i].lat, json[i].lng);
    var marker = new google.maps.Marker({
                listing_id: markerId,
                position: latLng,
                icon: base_url + 'images/template/markers/listing.png',
    });

    markers[markerId] = marker;
}

for(var marker in markers) {
    console.log('marker ID: ' + marker.listing_id);
    mc.addMarker(marker);
}
</code></pre>

<p>The <code>console.log</code> above returns undefined, and if I do <code>console.log(marker)</code> instead, I get the value of <code>marker.listing_id</code>. Sorry I'm getting confused! </p>

<p>I managed to get it to work with <code>$.each(markers, function(i, marker){});</code> but why does the <code>for..in</code> above not work?</p>


Iterating through an object hashtable

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

我试图使用哈希表，以便选择存储在数组/对象中的特定对象。但是，我在遍历对象时遇到了问题。var pins= {};pins[6] = '6';pins[7] = '7';pins[8] = '8';$('#result3').append('<div>Size: ' + Object.size(pins) + '</d...

问迭代对象哈希表
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

问迭代对象哈希表EN