blocks|key|825484|text|在普通浏览器中，flat方法是尚未执行+(只有Chrome+v69、Firefox和Opera56)。这是一个实验性的特征。因此，你还不能使用它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|825485|您可能希望拥有自己的flat函数：|825486|​|825487|Object.defineProperty(Array.prototype,+'flat',+{
++++value:+function(depth+=+1)+{
++++++return+this.reduce(function+(flat,+toFlatten)+{
++++++++return+flat.concat((Array.isArray(toFlatten)+&&+(depth>1))+?+toFlatten.flat(depth-1)+:+toFlatten);
++++++},+[]);
++++}
});

console.log(
++[1,+[2],+[3,+[[4]]]].flat(2)
);|code-block|syntax|javascript|825488|825489|代码来自这里，最初是由诺亚·弗雷塔斯实现的，目的是在没有指定depth的情况下将数组扁平化。|825490|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat#Browser_compatibility|1|https://stackoverflow.com/questions/10865025/merge-flatten-an-array-of-arrays-in-javascript|2|https://stackoverflow.com/users/1370576/noah-freitas^0|8|4|F|4|0|0|A|4|0|0|0|0|U|5|4|2|1|B|7|2|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1C|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1D|8|@]|D|@]|E|$M|N]]|$1|O|3|I|5|6|7|1E|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@$9|1I|A|1J|1|1K]|$9|1L|A|1M|1|1N]]|E|$]]|$1|R|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|S|$T|$5|U|V|W|E|$X|Y]]|Z|$5|U|V|W|E|$X|10]]|11|$5|U|V|W|E|$X|12]]]]

<p>The <code>flat</code> method is <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat#Browser_compatibility" rel="noreferrer">not yet implemented</a> in common browsers (only Chrome v69, Firefox Nightly and Opera 56). It’s an experimental feature. Therefore you cannot use it <em>yet</em>.</p>

<p>You may want to have your own <code>flat</code> function instead:</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>Object.defineProperty(Array.prototype, 'flat', {
    value: function(depth = 1) {
      return this.reduce(function (flat, toFlatten) {
        return flat.concat((Array.isArray(toFlatten) &amp;&amp; (depth&gt;1)) ? toFlatten.flat(depth-1) : toFlatten);
      }, []);
    }
});

console.log(
  [1, [2], [3, [[4]]]].flat(2)
);</code></pre>
</div>
</div>
</p>

<p>The code was taken from <a href="https://stackoverflow.com/questions/10865025/merge-flatten-an-array-of-arrays-in-javascript">here</a> by <a href="https://stackoverflow.com/users/1370576/noah-freitas">Noah Freitas</a> originally implemented to flatten the array with no <code>depth</code> specified.</p>


blocks|key|1936309|text|但是，不确定这是否是一个有效的答案，但是，在我的计划中，我使用了分配在ES6中引入的数组。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1936310|​|1936311|//+typeScriptArray:Array<Object>+=+new+Array<Object>();
let+concatArray+=+[];

let+firstArray+=+[1,2,3];
let+secondArray+=+[2,3,4];

concatArray.push(...firstArray);
concatArray.push(...secondArray);

console.log(concatArray);|code-block|syntax|javascript|1936312|1936313|这就像一种魅力，尽管我不确定是否会出现任何与之兼容的问题。|1936314|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment^0|W|2|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|10|8|@]|9|@]|C|$I|J]]|$1|K|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|12|8|@]|9|@]|C|$]]|$1|N|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|O|$P|$5|Q|R|S|C|$T|U]]]]

<p>Not sure if it is a valid answer however in my attemp to flat an array I employed the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment" rel="nofollow noreferrer">destructuring_assignment</a> introduced in ES6.</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>// typeScriptArray:Array&lt;Object&gt; = new Array&lt;Object&gt;();
let concatArray = [];

let firstArray = [1,2,3];
let secondArray = [2,3,4];

concatArray.push(...firstArray);
concatArray.push(...secondArray);

console.log(concatArray);</code></pre>
</div>
</div>
</p>

<p>It works like a charm even though I'm not sure if any broswer compatibily issues may arise.</p>


blocks|key|1936357|text|通过浏览器，Array.flat不是支持。下面是实现它的两种方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1936358|作为一个函数，depth变量指定input数组结构的深度(默认为1；使用Infinity尽可能深)，而stack是扁平数组，在递归调用时通过引用传递，并最终返回。|1936359|function+flat(input,+depth+=+1,+stack+=+[])
{
++++for+(let+item+of+input)
++++{
++++++++if+(item+instanceof+Array+&&+depth+>+0)
++++++++{
++++++++++++flat(item,+depth+-+1,+stack);
++++++++}
++++++++else+{
++++++++++++stack.push(item);
++++++++}
++++}
++++
++++return+stack;
}|code-block|syntax|javascript|1936360|作为一个多填充，如果您喜欢Array.prototype语法，可以扩展arr.flat()：|1936361|if+(!Array.prototype.flat)
{
++++Object.defineProperty(Array.prototype,+'flat',
++++{
++++++++value:+function(depth+=+1,+stack+=+[])
++++++++{
++++++++++++for+(let+item+of+this)
++++++++++++{
++++++++++++++++if+(item+instanceof+Array+&&+depth+>+0)
++++++++++++++++{
++++++++++++++++++++item.flat(depth+-+1,+stack);
++++++++++++++++}
++++++++++++++++else+{
++++++++++++++++++++stack.push(item);
++++++++++++++++}
++++++++++++}
++++++++++++
++++++++++++return+stack;
++++++++}
++++});
}|1936362|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat#Browser_compatibility^0|6|A|I|2|0|0|7|5|G|5|10|8|1F|5|0|0|D|F|Z|A|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1J|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

<p><code>Array.flat</code> is not <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat#Browser_compatibility" rel="noreferrer">supported</a> by your browser. Below are two ways to implement it.</p>
<p>As a function, the <code>depth</code> variable specifies how deep the <code>input</code> array structure should be flattened (defaults to 1; use <code>Infinity</code> to go as deep as it gets) while the <code>stack</code> is the flattened array, passed by reference on recursive calls and eventually returned.</p>
<pre><code>function flat(input, depth = 1, stack = [])
{
    for (let item of input)
    {
        if (item instanceof Array &amp;&amp; depth &gt; 0)
        {
            flat(item, depth - 1, stack);
        }
        else {
            stack.push(item);
        }
    }
    
    return stack;
}
</code></pre>
<p>As a Polyfill, extending <code>Array.prototype</code> if you prefer the <code>arr.flat()</code> syntax:</p>
<pre><code>if (!Array.prototype.flat)
{
    Object.defineProperty(Array.prototype, 'flat',
    {
        value: function(depth = 1, stack = [])
        {
            for (let item of this)
            {
                if (item instanceof Array &amp;&amp; depth &gt; 0)
                {
                    item.flat(depth - 1, stack);
                }
                else {
                    stack.push(item);
                }
            }
            
            return stack;
        }
    });
}
</code></pre>


blocks|key|1936368|text|使用_.flatten+(来自房源包)+;)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1936369|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

<p>use _.flatten from lodash package ;)</p>


blocks|key|2060129|text|这也是可行的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2060130|let+arr+=+[+[1,2,3],+[2,3,4]+];
console.log([].concat(...arr))|code-block|syntax|javascript|2060131|或者是旧的浏览器，|2060132|[].concat.apply([],+arr);|2060133|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>This can also work.</p>

<pre><code>let arr = [ [1,2,3], [2,3,4] ];
console.log([].concat(...arr))
</code></pre>

<p>Or for older browsers,</p>

<pre><code>[].concat.apply([], arr);
</code></pre>


blocks|key|2060153|text|类似的问题，通过使用ES6+.reduce()方法解决：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2060154|const+flatArr+=+result.reduce((acc,+curr)+=>+acc.concat(curr),[]);|code-block|syntax|javascript|2060155|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>Similar issue, solved by using ES6 .reduce() method:</p>
<pre><code>const flatArr = result.reduce((acc, curr) =&gt; acc.concat(curr),[]);
</code></pre>


blocks|key|2060201|text|另一种简单的解决方案是_.flattenDeep()+on+on|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2060202|https://lodash.com/docs/4.17.15#flattenDepth|2060203|​|2060204|const+flatArrays+=+_.flattenDeep([1,+[2],+[3,+[[4]]]]);

console.log(flatArrays);|code-block|syntax|javascript|2060205|<script+src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>|2060206|2060207|entityMap|0|LINK|mutability|MUTABLE|url^0|B|F|U|2|0|0|18|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|14|8|@]|E|@$9|15|A|16|1|17]]|F|$]]|$1|I|3|J|5|6|7|18|8|@]|E|@]|F|$]]|$1|K|3|L|5|M|7|19|8|@]|E|@]|F|$N|O]]|$1|P|3|Q|5|M|7|1A|8|@]|E|@]|F|$N|O]]|$1|R|3|J|5|6|7|1B|8|@]|E|@]|F|$]]|$1|S|3|-4|5|6|7|1C|8|@]|E|@]|F|$]]]|T|$U|$5|V|W|X|F|$Y|H]]]]

<p>Another simple solution is <code>_.flattenDeep()</code> on <strong>lodash</strong></p>
<p><a href="https://lodash.com/docs/4.17.15#flattenDepth" rel="nofollow noreferrer">https://lodash.com/docs/4.17.15#flattenDepth</a></p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="true">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const flatArrays = _.flattenDeep([1, [2], [3, [[4]]]]);

console.log(flatArrays);</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"&gt;&lt;/script&gt;</code></pre>
</div>
</div>
</p>


blocks|key|1936439|text|const+array+=+[
++[
++++[6,+6],
++++[3,+3],
++],
++[[7,+7,+[9]]],
]

function+simplifyArray(array)+{
++const+result+=+[]

++function+recursivePushElem(arr)+{
++++arr.forEach(i+=>+{
++++++if+(Array.isArray(i))+recursivePushElem(i)
++++++else+result.push(i)
++++})
++}
++recursivePushElem(array)

++console.log(result)
++return+result
}

simplifyArray(array)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1936440|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>const array = [
  [
    [6, 6],
    [3, 3],
  ],
  [[7, 7, [9]]],
]

function simplifyArray(array) {
  const result = []

  function recursivePushElem(arr) {
    arr.forEach(i =&gt; {
      if (Array.isArray(i)) recursivePushElem(i)
      else result.push(i)
    })
  }
  recursivePushElem(array)

  console.log(result)
  return result
}

simplifyArray(array)
</code></pre>


blocks|key|825669|text|var+arr=[[1,2],[3,4],[5,6]];
var+result=[].concat(...arr);
console.log(result);++++//output:+[+1,+2,+3,+4,+5,+6+]|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|825670|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=[[1,2],[3,4],[5,6]];
var result=[].concat(...arr);
console.log(result);    //output: [ 1, 2, 3, 4, 5, 6 ]
</code></pre>


blocks|key|1936475|text|您可以简单地使用这个[].concat(...objArrs)，它将与flat()方法一样工作，并允许在浏览器中具有更高的兼容性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1936476|entityMap^0|A|L|Z|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

<p>you could simply use this <code>[].concat(...objArrs)</code> that would work the same as the <code>flat()</code> method and allow more compatibility in browsers</p>


<p>The following code</p>

<pre><code>function steamrollArray(arr) {
  // I'm a steamroller, baby
  return arr.flat();
}

steamrollArray([1, [2], [3, [[4]]]]);
</code></pre>

<p>returns</p>

<blockquote>
  <p><code>arr.flat</code> is not a function</p>
</blockquote>

<p>I tried it in <strong>Firefox</strong> and <strong>Chrome v67</strong> and the same result has happened.</p>

<p>What's wrong?</p>


.flat() is not a function, what's wrong?

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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以下代码function steamrollArray(arr) {  // I'm a steamroller, baby  return arr.flat();}steamrollArray([1, [2], [3, [[4]]]]);返回arr.flat不是一个函数我在火狐和Chrome v67上试过，同样的结果...

问.flat()不是函数，怎么了？
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问.flat()不是函数，怎么了？
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