blocks|key|363718|text|var+arr+=+[];
for(var+i=1;+i<=mynumber;+i%2B%2B)+{
+++arr.push(i.toString());
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|363719|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 arr = [];
for(var i=1; i&lt;=mynumber; i++) {
   arr.push(i.toString());
}
</code></pre>


blocks|key|579731|text|在ES2015中，这可以使用Array.from方法在单个表达式中简洁地实现，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|579732|Array.from({+length:+10+},+(_,+idx)+=>+`${%2B%2Bidx}`)|code-block|syntax|javascript|579733|from的第一个参数是一个类似数组的对象，它提供了一个长度属性。第二个参数是一个映射函数，它允许我们根据您的请求将默认的undefined值替换为它们调整后的索引值。查看规范here|579734|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ecma-international.org/ecma-262/6.0/|1|http://www.ecma-international.org/ecma-262/6.0/#sec-array.from^0|E|A|1|6|0|0|0|0|4|1O|9|2F|4|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|M|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

<p>With <a href="http://www.ecma-international.org/ecma-262/6.0/" rel="noreferrer">ES2015</a>, this can be achieved concisely in a single expression using the <code>Array.from</code> method like so:</p>

<pre><code>Array.from({ length: 10 }, (_, idx) =&gt; `${++idx}`)
</code></pre>

<p>The first argument to <code>from</code> is an array like object that provides a length property. The second argument is a map function that allows us to replace the default <code>undefined</code> values with their adjusted index values as you requested. Checkout the specification <a href="http://www.ecma-international.org/ecma-262/6.0/#sec-array.from" rel="noreferrer">here</a></p>


blocks|key|363710|text|听起来您只是想构造一个包含整数值的字符串版本的数组。一种简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|363711|var+arr+=+[];
for+(var+i+=+1;+i+<=+mynumber;+i%2B%2B)+arr.push(""%2Bi);|code-block|syntax|javascript|363712|对于更有趣的版本，你可以做一个生成器...|363713|function+tail(i,+maxval)+{
++++return+[i].concat(i+<+maxval+?+tail(i%2B1,+maxval)+:+[]);
}

var+arr+=+tail(1,+mynumber);|363714|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Sounds like you just want to construct an array that contains the string versions of the integer values.  A simple approach:</p>

<pre><code>var arr = [];
for (var i = 1; i &lt;= mynumber; i++) arr.push(""+i);
</code></pre>

<p>For a more interesting version you could do a generator...</p>

<pre><code>function tail(i, maxval) {
    return [i].concat(i &lt; maxval ? tail(i+1, maxval) : []);
}

var arr = tail(1, mynumber);
</code></pre>


blocks|key|579533|text|var+arr+=+[];
while(mynumber--)+{
++++arr[mynumber]+=+String(mynumber%2B1);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|579534|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 arr = [];
while(mynumber--) {
    arr[mynumber] = String(mynumber+1);
}
</code></pre>


blocks|key|579790|text|我会这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|579791|​|579792|var+num+=+10,
++dynar+=+[...Array(num)].map((_,i)+=>+%2B%2Bi%2B"");
console.log(dynar);|code-block|syntax|javascript|579793|579794|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

<p>I would do as follows;</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var num = 10,
  dynar = [...Array(num)].map((_,i) =&gt; ++i+"");
console.log(dynar);</code></pre>
</div>
</div>
</p>


blocks|key|579605|text|错误阅读了问题，已更正。尝试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|579606|var+myNumber+=+100,
++++myarr+=+(function+arr(i){return+i+?+arr(i-1).concat(i)+:+[i]}(myNumber));|code-block|syntax|javascript|579607|只是为了好玩，如果你像这样扩展Array：|offset|length|style|CODE|579608|Array.prototype.mapx+=+function(callback){
++return+String(this).split(',').map(callback);
}|579609|您可以使用：|579610|var+myNum+=+100,+
++++myarr+=+new+Array(myNum).mapx(function(el,i){return+i%2B1;});|579611|entityMap^0|0|0|F|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

<p>misread the question, corrected. Try:</p>

<pre><code>var myNumber = 100,
    myarr = (function arr(i){return i ? arr(i-1).concat(i) : [i]}(myNumber));
</code></pre>

<p>Just for fun, if you extend <code>Array</code> like this:</p>

<pre><code>Array.prototype.mapx = function(callback){
  return String(this).split(',').map(callback);
}
</code></pre>

<p>You could use:</p>

<pre><code>var myNum = 100, 
    myarr = new Array(myNum).mapx(function(el,i){return i+1;});
</code></pre>


blocks|key|579826|text|我遇到了类似的问题，我找到的解决方案(忘记在哪里找到了)是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|579827|Array.from(Array(mynumber),+(val,+index)+=>+index+%2B+1)|offset|length|style|CODE|579828|entityMap^0|0|0|1I|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

<p>I had a similar problem and a solution I found (forgot where I found it) is this:</p>

<p><code>Array.from(Array(mynumber), (val, index) =&gt; index + 1)</code></p>


blocks|key|579906|text|这个游戏有点晚了，但是现在你可以用ES6做一些很酷的事情。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|579907|现在，您可以在一行代码中使用随机数填充动态长度数组！|579908|[...Array(10).keys()].map(()+=>+Math.floor(Math.random()+*+100))|code-block|syntax|javascript|579909|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>A little late to this game, but there is REALLY cool stuff you can do with ES6 these days.</p>
<p>You can now fill an array of dynamic length with random numbers in one line of code!</p>
<pre><code>[...Array(10).keys()].map(() =&gt; Math.floor(Math.random() * 100))
</code></pre>


blocks|key|363759|text|如果你在问是否有一个内建的Pythonic+range-like函数，那是没有的，你必须用蛮力的方式来做。也许你会对rangy感兴趣。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|363760|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/rangy/^0|M|5|1M|5|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

<p>If you are asking whether there is a built in Pythonic <code>range</code>-like function, there isn't.  You have to do it the brute force way.  Maybe <a href="http://code.google.com/p/rangy/" rel="nofollow">rangy</a> would be of interest to you.</p>


blocks|key|363997|text|更新=>+2020年6月|type|unstyled|depth|inlineStyleRanges|entityRanges|data|363998|如果您使用的是node+js，则可以使用“，”运算符创建或附加字符串值，然后在循环内可以|363999|for+(var+j+=+0;+j+<=+data.legth+-1;+j%2B%2B)+{
++++++++++++++++++++lang+%2B=+data.lang++%2B",+"+;

++++++++++++++++}

+var+langs+=+lang.split(',')
+console.log("Languages+=>",++lang,+typeof(lang),+typeof(langs),+langs)+
+console.log(lang[0])+//+here+access+arrary+by+index+value|code-block|syntax|javascript|364000|您可以看到字符串和对象的类型|364001|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<h1>updated = &gt; june 2020</h1>
<h2>if are you using node js you can create or append a string value with &quot; ,&quot; operator then  inside the loop you can</h2>
<pre><code>for (var j = 0; j &lt;= data.legth -1; j++) {
                    lang += data.lang  +&quot;, &quot; ;

                }

 var langs = lang.split(',')
 console.log(&quot;Languages =&gt;&quot;,  lang, typeof(lang), typeof(langs), langs) 
 console.log(lang[0]) // here access arrary by index value
            

</code></pre>
<p>you can see the type of  string and object</p>


blocks|key|363852|text|和你想要动态填充的所有数组的方法一样。一个for循环。Suedo代码是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|363853|arr+=array()
for(i;+i<max;+i%2B%2B){
+arr[]=i

}|code-block|syntax|javascript|363854|这应该会对你有所帮助。|363855|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|$]]

<p>The same way you would for all arrays you want to fill dynamically.
A for loop.
Suedo code is</p>

<pre><code>arr =array()
for(i; i&lt;max; i++){
 arr[]=i

}
</code></pre>

<p>that should help you on the way</p>


<p>What's the most efficient way to create this simple array dynamically.</p>

<pre><code>var arr = [ "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"];
</code></pre>

<p>Let's say we can get the number 10 from a variable</p>

<pre><code>var mynumber = 10;
</code></pre>


javascript - Create Simple Dynamic Array

动态创建这个简单数组的最有效方法是什么？var arr = [ "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"];假设我们可以从一个变量中获得数字10var mynumber = 10;

问javascript -创建简单的动态数组
EN

回答 11

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问javascript -创建简单的动态数组EN

回答 11

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问javascript -创建简单的动态数组
EN