blocks|key|612696|text|无法知道options数组的两个成员是否来自名为size和color的变量。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|612697|它们也不一定是专门调用的，任何变量也可以指向那个数组。|612698|var+notSize+=+size;

console.log(options[0]);+//+It+is+`size`+or+`notSize`?|code-block|syntax|javascript|612699|你可以做的一件事就是在那里使用一个对象。|612700|var+options+=+{
++++size:+size,
++++color:+color
}|612701|然后，您可以访问options.size或options.color。|612702|entityMap^0|4|7|O|4|T|5|0|0|0|0|0|8|C|L|D|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|T|$]]

There is no way to know that the two members of the <code>options</code> array came from variables named <code>size</code> and <code>color</code>.

They are also not necessarily called that exclusively, any variable could also point to that array.

<pre><code>var notSize = size;

console.log(options[0]); // It is `size` or `notSize`?
</code></pre>

One thing you can do is use an object there instead...

<pre><code>var options = {
 size: size,
 color: color
}
</code></pre>

Then you could access <code>options.size</code> or <code>options.color</code>.

blocks|key|396721|text|你不能。数组没有名字。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|396722|您只有两个对数组的引用，一个在变量中，另一个在第三个数组中。|396723|没有办法找到给定对象存在的所有引用。|396724|如果名称很重要，则将其与数据一起存储。|396725|var+size+=+{+data:+["S",+"M",+"L",+"XL",+"XXL"],+name:+'size'+};
var+color+=+{+data:+["Red",+"Blue",+"Green",+"White",+"Black"],+name:+'color'+};
var+options+=+[size,+color];|code-block|syntax|javascript|396726|显然，您必须修改访问数据的现有代码(因为您现在使用的是options[0].data[0]而不是options[0][0]，但您也使用了options[0].name)。|offset|length|style|CODE|396727|entityMap^0|0|0|0|0|0|R|I|1C|D|1W|F|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$O|10|P|11|Q|R]|$O|12|P|13|Q|R]|$O|14|P|15|Q|R]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

You can't. The array doesn't have a name.

You just have two references to the array, one in the variable and another in the third array.

There is no way to find all the references that exist for a given object.

If the name is important, then store it with the data.

<pre><code>var size = { data: ["S", "M", "L", "XL", "XXL"], name: 'size' };
var color = { data: ["Red", "Blue", "Green", "White", "Black"], name: 'color' };
var options = [size, color];
</code></pre>

Obviously you'll have to modify the existing code which accesses the data (since you now have <code>options[0].data[0]</code> instead of <code>options[0][0]</code> but you also have <code>options[0].name</code>).

blocks|key|612819|text|是的。您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|612820|alert(options[0][0])|code-block|syntax|javascript|612821|获取大小"S“|612822|或|612823|alert(options[0][1])|612824|获取“红色”的颜色|612825|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Yes it is.
You can use 

<pre><code>alert(options[0][0])
</code></pre>

to get the size "S"

or

<pre><code>alert(options[0][1])
</code></pre>

to get the color "Red"

blocks|key|396826|text|在这种情况下，您不希望将size和color插入到数组中，而是插入到对象中|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|396827|var+options+=+{+
++++'size':+size,
++++'color':+color
++};|code-block|syntax|javascript|396828|之后，您可以通过以下方式访问密钥集|396829|var+keys+=+Object.keys(+options+);|396830|entityMap^0|C|4|H|5|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|$]]

In that case you don't want to insert <code>size</code> and <code>color</code> inside an array, but into an object

<pre><code>var options = { 
 'size': size,
 'color': color
 };
</code></pre>

Afterwards you can access the sets of keys by 

<pre><code>var keys = Object.keys( options );
</code></pre>

blocks|key|612949|text|您已经创建了一个数组数组(多维)，因此本例中的选项是大小数组。您需要引用该子元素的第一个元素，它对您来说是:+options。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|612950|如果您想遍历所有条目，可以使用here中介绍的for+..+in+...语法。|offset|length|style|CODE|612951|var+a+=+[1,2,4,5,120,12];
for+(var+val+in+t)+{
++++console.log(t[val]);
}

var+b+=+['S','M','L'];
var+both+=+[a,b];

for+(var+val+in+both)+{
+++++for(val2+in+both[val]){console.log(both[val][val2])}
}|code-block|syntax|javascript|612952|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/JavaScript/Reference/Statements/for...in^0|0|N|D|F|4|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

You've made an array of arrays (multidimensional), so options[0] in this case is the size array. you need to reference the first element of the child, which for you is: options[0][0].

If you wanted to loop through all entries you can use the <code>for .. in ...</code> syntax which is described <a href="https://developer.mozilla.org/en/JavaScript/Reference/Statements/for...in" rel="nofollow">here</a>.

<pre><code>var a = [1,2,4,5,120,12];
for (var val in t) {
 console.log(t[val]);
}

var b = ['S','M','L'];
var both = [a,b];

for (var val in both) {
 for(val2 in both[val]){console.log(both[val][val2])}
}
</code></pre>

blocks|key|612994|text|我会像这样创建一个对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|612995|var+options+=+{+
++++size:+["S",+"M",+"L",+"XL",+"XXL"],
++++color:+["Red",+"Blue",+"Green",+"White",+"Black"]
};


alert(Object.keys(options));|code-block|syntax|javascript|612996|要单独访问密钥，请执行以下操作：|612997|for+(var+key+in+options)+{
++++alert(key);
}|612998|附注:当你创建一个新的数组对象时，不要使用new+Array，而要使用[]。|offset|length|style|CODE|612999|entityMap^0|0|0|0|0|L|9|Z|2|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]|$M|Z|N|10|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

I would create an object like this:

<pre><code>var options = { 
 size: ["S", "M", "L", "XL", "XXL"],
 color: ["Red", "Blue", "Green", "White", "Black"]
};


alert(Object.keys(options));
</code></pre>

To access the keys individualy:

<pre><code>for (var key in options) {
 alert(key);
}
</code></pre>

P.S.: when you create a new array object do not use <code>new Array</code> use <code>[]</code> instead.

blocks|key|396965|text|您可以使用key值，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|396966|var+size+=+new+Array("S",+"M",+"L",+"XL",+"XXL");
var+color+=+new+Array("Red",+"Blue",+"Green",+"White",+"Black");
var+options+=+new+Array(size,+color);

var+len+=+options.length;
for(var+i+=+0;+i<len;+i%2B%2B)
{++
+for(var+key+in+options[i])
++++{
+++++++alert(options[i][key])
++++}

}|code-block|syntax|javascript|396967|查看此处：http://jsfiddle.net/8hmRk/8/|396968|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/8hmRk/8/^0|5|3|0|0|5|S|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

you can get using <code>key</code> value something like this :

<pre><code>var size = new Array("S", "M", "L", "XL", "XXL");
var color = new Array("Red", "Blue", "Green", "White", "Black");
var options = new Array(size, color);

var len = options.length;
for(var i = 0; i&lt;len; i++)
{ 
 for(var key in options[i])
 {
 alert(options[i][key])
 }

}
</code></pre>

see here : <a href="http://jsfiddle.net/8hmRk/8/" rel="noreferrer">http://jsfiddle.net/8hmRk/8/</a>

blocks|key|613088|text|数组就像任何其他对象一样。如果你愿意，你可以给它一个名字。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|613089|var+size+=+new+Array("S",+"M",+"L",+"XL",+"XXL");
var+color+=+new+Array("Red",+"Blue",+"Green",+"White",+"Black");
var+options+=+new+Array(+size,+color);
color.name+=+"color";
size.name+=+"size";
options[0].name+==+"size"
>true|code-block|syntax|javascript|613090|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|$]]

Array is just like any other object. You can give it a name if you want.

<pre><code>var size = new Array("S", "M", "L", "XL", "XXL");
var color = new Array("Red", "Blue", "Green", "White", "Black");
var options = new Array( size, color);
color.name = "color";
size.name = "size";
options[0].name == "size"
&gt;true
</code></pre>

Here is the example of what I am doing:
<pre><code> var size = new Array(&quot;S&quot;, &quot;M&quot;, &quot;L&quot;, &quot;XL&quot;, &quot;XXL&quot;);
 var color = new Array(&quot;Red&quot;, &quot;Blue&quot;, &quot;Green&quot;, &quot;White&quot;, &quot;Black&quot;);
 var options = new Array( size, color);
</code></pre>
I am doing a loop select form thingies which work good, but I want to fetch the Array child name, in this case - size or color. When I am doing alert(options[0]), I get the whole elements of array. But for some specific case, I want to get only the array name, which is size/color like I have said already. Is there way to achieve that?

Javascript Array inside Array - how can I call the child array name?

下面是我正在做的例子：   var size = new Array("S", "M", "L", "XL", "XXL");   var color = new Array("Red", "Blue", "Green", "White", "Black");   var options = new Array( si...

问数组中的Javascript数组-如何调用子数组名称？
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问数组中的Javascript数组-如何调用子数组名称？
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