blocks|key|695142|text|某些浏览器支持Array.indexOf()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|695143|如果不是这样，您可以通过其原型来扩充Array对象，如下所示……|695144|if+(!Array.prototype.indexOf)
{
++Array.prototype.indexOf+=+function(searchElement+/*,+fromIndex+*/)
++{
++++"use+strict";

++++if+(this+===+void+0+%7C%7C+this+===+null)
++++++throw+new+TypeError();

++++var+t+=+Object(this);
++++var+len+=+t.length+>>>+0;
++++if+(len+===+0)
++++++return+-1;

++++var+n+=+0;
++++if+(arguments.length+>+0)
++++{
++++++n+=+Number(arguments[1]);
++++++if+(n+!==+n)+//+shortcut+for+verifying+if+it's+NaN
++++++++n+=+0;
++++++else+if+(n+!==+0+&&+n+!==+(1+/+0)+&&+n+!==+-(1+/+0))
++++++++n+=+(n+>+0+%7C%7C+-1)+*+Math.floor(Math.abs(n));
++++}

++++if+(n+>=+len)
++++++return+-1;

++++var+k+=+n+>=+0
++++++++++?+n
++++++++++:+Math.max(len+-+Math.abs(n),+0);

++++for+(;+k+<+len;+k%2B%2B)
++++{
++++++if+(k+in+t+&&+t[k]+===+searchElement)
++++++++return+k;
++++}
++++return+-1;
++};
}|code-block|syntax|javascript|695145|Source。|695146|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf|1|https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf#Compatibility^0|7|F|7|F|0|0|I|5|0|0|0|6|1|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|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|18|8|@]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|O|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

<p>Some browsers support <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf" rel="noreferrer"><code>Array.indexOf()</code></a>.</p>

<p>If not, you could augment the <code>Array</code> object via its prototype like so...</p>

<pre><code>if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(searchElement /*, fromIndex */)
  {
    "use strict";

    if (this === void 0 || this === null)
      throw new TypeError();

    var t = Object(this);
    var len = t.length &gt;&gt;&gt; 0;
    if (len === 0)
      return -1;

    var n = 0;
    if (arguments.length &gt; 0)
    {
      n = Number(arguments[1]);
      if (n !== n) // shortcut for verifying if it's NaN
        n = 0;
      else if (n !== 0 &amp;&amp; n !== (1 / 0) &amp;&amp; n !== -(1 / 0))
        n = (n &gt; 0 || -1) * Math.floor(Math.abs(n));
    }

    if (n &gt;= len)
      return -1;

    var k = n &gt;= 0
          ? n
          : Math.max(len - Math.abs(n), 0);

    for (; k &lt; len; k++)
    {
      if (k in t &amp;&amp; t[k] === searchElement)
        return k;
    }
    return -1;
  };
}
</code></pre>

<p><a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf#Compatibility" rel="noreferrer">Source</a>.</p>


blocks|key|695151|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|695152|if(blockedTile.indexOf("118")+!=+-1)
{++
+++//+element+found
}|code-block|syntax|javascript|695153|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>Try this:</p>

<pre><code>if(blockedTile.indexOf("118") != -1)
{  
   // element found
}
</code></pre>


blocks|key|695167|text|if(array.indexOf("67")+!=+-1)+//+is+in+array|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|695168|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>if(array.indexOf("67") != -1) // is in array
</code></pre>


blocks|key|911278|text|function+in_array(needle,+haystack){
++++var+found+=+0;
++++for+(var+i=0,+len=haystack.length;i<len;i%2B%2B)+{
++++++++if+(haystack[i]+==+needle)+return+i;
++++++++++++found%2B%2B;
++++}
++++return+-1;
}
if(in_array("118",array)!=+-1){
//is+in+array
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|911279|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>function in_array(needle, haystack){
    var found = 0;
    for (var i=0, len=haystack.length;i&lt;len;i++) {
        if (haystack[i] == needle) return i;
            found++;
    }
    return -1;
}
if(in_array("118",array)!= -1){
//is in array
}
</code></pre>


blocks|key|911323|text|我会使用不同的数据结构，因为数组似乎不是最好的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|911324|使用对象作为哈希表，而不是数组，如下所示：|911325|(也在jsbin中发布)|offset|length|911326|var+arr+=+["x",+"y",+"z"];
var+map+=+{};
for+(var+k=0;+k+<+arr.length;+%2B%2Bk)+{
++map[arr[k]]+=+true;
}

function+is_in_map(key)+{
++try+{
++++return+map[key]+===+true;
++}+catch+(e)+{
++++return+false;
++}
}


function+print_check(key)+{
++console.log(key+%2B+"+exists?+-+"+%2B+(is_in_map(key)+?+"yes"+:+"no"));
}

print_check("x");
print_check("a");|code-block|syntax|javascript|911327|控制台输出：|911328|x+exists?+-+yes
a+exists?+-+no|911329|这是一个简单的解决方案。如果你更喜欢面向对象的方法，那么可以在谷歌上搜索"js+hashtable"。|911330|entityMap|0|LINK|mutability|MUTABLE|url|http://jsbin.com/kozepehe/1/edit?js,console|1|https://www.google.co.il/search?q=js%2520hashtable^0|0|0|3|5|0|0|0|0|0|10|E|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@$F|15|G|16|1|17]]|A|$]]|$1|H|3|I|5|J|7|18|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1B|8|@]|9|@$F|1C|G|1D|1|1E]]|A|$]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

<p>I'd use a different data structure, since array seem to be not the best solution.</p>

<p>Instead of array, use an object as a hash-table, like so:</p>

<p>(posted also in <a href="http://jsbin.com/kozepehe/1/edit?js,console" rel="nofollow">jsbin</a>)</p>

<pre><code>var arr = ["x", "y", "z"];
var map = {};
for (var k=0; k &lt; arr.length; ++k) {
  map[arr[k]] = true;
}

function is_in_map(key) {
  try {
    return map[key] === true;
  } catch (e) {
    return false;
  }
}


function print_check(key) {
  console.log(key + " exists? - " + (is_in_map(key) ? "yes" : "no"));
}

print_check("x");
print_check("a");
</code></pre>

<p>Console output:</p>

<pre><code>x exists? - yes
a exists? - no
</code></pre>

<p>That's a straight-forward solution. If you're more into an object oriented approach, then search Google for <a href="https://www.google.co.il/search?q=js%20hashtable" rel="nofollow">"js hashtable"</a>.</p>


blocks|key|695326|text|为什么不使用Array.filter呢？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|695327|var+array+=+['x','y','z'];
array.filter(function(item,index,array){return(item==YOURVAL)}).|code-block|syntax|javascript|695328|只需将其复制到您的代码中，就可以了：|695329|Array.prototype.inArray+=+function+(searchedVal)+{
return+this.filter(function(item,index,array){return(item==searchedVal)}).length==true
}|695330|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>Why don't you use Array.filter?</p>

<pre><code>var array = ['x','y','z'];
array.filter(function(item,index,array){return(item==YOURVAL)}).
</code></pre>

<p>Just copy that into your code, and here you go:</p>

<pre><code>Array.prototype.inArray = function (searchedVal) {
return this.filter(function(item,index,array){return(item==searchedVal)}).length==true
}
</code></pre>


blocks|key|911468|text|与旧浏览器的兼容性最好|type|unstyled|depth|inlineStyleRanges|entityRanges|data|911469|​|911470|Array.prototype.inArray+=+function(+needle+){

++++return+Array(this).join(",").indexOf(needle)+>-1;

}

var+foods+=+["Cheese","Onion","Pickle","Ham"];
test+=+foods.inArray("Lemon");
console.log(+"Lemon+is+"+%2B+(test+?+""+:+"not+")+%2B+"in+the+list."+);|code-block|syntax|javascript|911471|911472|通过将数组副本转换为CSV字符串，您可以在较旧的浏览器中测试该字符串。|911473|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

<p>IMHO most compatible with older browsers</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>Array.prototype.inArray = function( needle ){

    return Array(this).join(",").indexOf(needle) &gt;-1;

}

var foods = ["Cheese","Onion","Pickle","Ham"];
test = foods.inArray("Lemon");
console.log( "Lemon is " + (test ? "" : "not ") + "in the list." );</code></pre>
</div>
</div>
</p>
<p>By turning an Array copy in to a CSV string, you can test the string in older browsers.</p>


blocks|key|911556|text|在数组示例中，它在php+(in_array)中也是如此。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|911557|+var+ur_fit+=+["slim_fit",+"tailored",+"comfort"];
+var+ur_length+=+["length_short",+"length_regular",+"length_high"];
++++if(ur_fit.indexOf(data_this)!=-1){
++++++++alert("Value+is+avail+in+ur_fit+array");
++++}
++++else+if(ur_length.indexOf(data_this)!=-1){++++++
+++++++++alert("value+is+avail+in+ur_legth+array");+

++++}|code-block|syntax|javascript|911558|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>in array example,Its same in php (in_array)  </p>

<pre><code> var ur_fit = ["slim_fit", "tailored", "comfort"];
 var ur_length = ["length_short", "length_regular", "length_high"];
    if(ur_fit.indexOf(data_this)!=-1){
        alert("Value is avail in ur_fit array");
    }
    else if(ur_length.indexOf(data_this)!=-1){      
         alert("value is avail in ur_legth array"); 

    }
</code></pre>


blocks|key|911626|text|只需根据您的口味使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|911627|​|911628|var+blockedTile+=+[118,+67,+190,+43,+135,+520];

//+includes+(js)

if+(+blockedTile.includes(118)+){
++++console.log('Found+with+"includes"');
}

//+indexOf+(js)

if+(+blockedTile.indexOf(67)+!==+-1+){
++++console.log('Found+with+"indexOf"');
}

//+_.indexOf+(Underscore+library)

if+(+_.indexOf(blockedTile,+43,+true)+){
++++console.log('Found+with+Underscore+library+"_.indexOf"');
}

//+$.inArray+(jQuery+library)

if+(+$.inArray(190,+blockedTile)+!==+-1+){
++++console.log('Found+with+jQuery+library+"$.inArray"');
}|code-block|syntax|javascript|911629|<script+src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script+src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>|911630|911631|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|K|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

<p>Just use for your taste:</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 blockedTile = [118, 67, 190, 43, 135, 520];

// includes (js)

if ( blockedTile.includes(118) ){
    console.log('Found with "includes"');
}

// indexOf (js)

if ( blockedTile.indexOf(67) !== -1 ){
    console.log('Found with "indexOf"');
}

// _.indexOf (Underscore library)

if ( _.indexOf(blockedTile, 43, true) ){
    console.log('Found with Underscore library "_.indexOf"');
}

// $.inArray (jQuery library)

if ( $.inArray(190, blockedTile) !== -1 ){
    console.log('Found with jQuery library "$.inArray"');
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"&gt;&lt;/script&gt;
&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;</code></pre>
</div>
</div>
</p>


blocks|key|911654|text|var+myArray+=+[2,5,6,7,9,6];
myArray.includes(2)+//+is+true
myArray.includes(14)+//+is+false|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|911655|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 myArray = [2,5,6,7,9,6];
myArray.includes(2) // is true
myArray.includes(14) // is false
</code></pre>


blocks|key|911718|text|你可以试试下面的代码。检查http://api.jquery.com/jquery.grep/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|911719|var+blockedTile+=+new+Array("118",+"67",+"190",+"43",+"135",+"520");
var+searchNumber+=+"11878";
arr+=+jQuery.grep(blockedTile,+function(+i+)+{
++return+i+===+searchNumber;
});
if(arr.length){+console.log('Present');+}else{+console.log('Not+Present');+}|code-block|syntax|javascript|911720|如果大于0表示字符串存在，则检查arr.length，否则不存在。|911721|entityMap|0|LINK|mutability|MUTABLE|url|http://api.jquery.com/jquery.grep/^0|D|Y|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<p>You can try below code. Check <a href="http://api.jquery.com/jquery.grep/" rel="nofollow noreferrer">http://api.jquery.com/jquery.grep/</a></p>

<pre><code>var blockedTile = new Array("118", "67", "190", "43", "135", "520");
var searchNumber = "11878";
arr = jQuery.grep(blockedTile, function( i ) {
  return i === searchNumber;
});
if(arr.length){ console.log('Present'); }else{ console.log('Not Present'); }
</code></pre>

<p>check arr.length if it's more than 0 means string is present else it's not present.</p>


blocks|key|911763|text|我认为最简单的方法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|911764|(118+in+blockedTile);+//is+true+|code-block|syntax|javascript|911765|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>I think the simplest way is that :</p>

<pre><code>(118 in blockedTile); //is true 
</code></pre>


blocks|key|695704|text|在2019年，最好的方法就是使用.includes()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|695705|[1,+2,+3].includes(2);+++++//+true
[1,+2,+3].includes(4);+++++//+false
[1,+2,+3].includes(1,+2);++//+false|code-block|syntax|javascript|695706|第一个参数是您要搜索的内容。第二个参数是该数组中开始搜索的索引位置。|695707|如果你需要在这里进行交叉浏览--这里有很多传统的答案。|695708|entityMap^0|G|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|V|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

<p>Best way to do it in 2019 is by using <code>.includes()</code></p>

<pre><code>[1, 2, 3].includes(2);     // true
[1, 2, 3].includes(4);     // false
[1, 2, 3].includes(1, 2);  // false
</code></pre>

<p>First parameter is what you are searching for. Second parameter is the index position in this array at which to begin searching.</p>

<p>If you need to be crossbrowsy here - there are plenty of legacy answers.</p>


blocks|key|911857|text|我这边的一些代码(Array的自定义函数)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|911858|++++Array.prototype.in_array+=+function+(array)+{
++++++++var+$i+=+0;
++++++++var+type+=+typeof+array;
++++++++while+(this[$i])+{
++++++++++++if+((type+==+('number')+%7C%7C+type+==+('string'))++&&+array+==+this[$i])+{
++++++++++++++++return+true;
++++++++++++}+else+if+(type+==+'object'+&&+array+instanceof+Array+&&+array.in_array(this[$i]))+{
++++++++++++++++return+true
++++++++++++}
++++++++++++$i%2B%2B;
++++++++}
++++++++return+false;
++++};


++++var+array+=+[1,+2,+3,+"a",+"b",+"c"];

++++//if+string+in+array
++++if+(array.in_array('b'))+{
++++++++console.log("in+array");
++++}

++++//if+number+in+array
++++if+(array.in_array(3))+{
++++++++console.log("in+array");
++++}

++++//+if+one+from+array+in+array
++++if+(array.in_array([1,+'b']))+{
++++++++console.log("in+array");
++++}|code-block|syntax|javascript|911859|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>a little bit code from my side (custom function for Array):</p>
<pre><code>    Array.prototype.in_array = function (array) {
        var $i = 0;
        var type = typeof array;
        while (this[$i]) {
            if ((type == ('number') || type == ('string'))  &amp;&amp; array == this[$i]) {
                return true;
            } else if (type == 'object' &amp;&amp; array instanceof Array &amp;&amp; array.in_array(this[$i])) {
                return true
            }
            $i++;
        }
        return false;
    };


    var array = [1, 2, 3, &quot;a&quot;, &quot;b&quot;, &quot;c&quot;];

    //if string in array
    if (array.in_array('b')) {
        console.log(&quot;in array&quot;);
    }

    //if number in array
    if (array.in_array(3)) {
        console.log(&quot;in array&quot;);
    }

    // if one from array in array
    if (array.in_array([1, 'b'])) {
        console.log(&quot;in array&quot;);
    }
</code></pre>


<p>Let's say I have this:</p>

<pre><code>var blockedTile = new Array("118", "67", "190", "43", "135", "520");
</code></pre>

<p>There's more array elements but those are just few for readability purposes. Anyways, I could do a "for" loop but it would do 500 loops everytime you click on the map... is there any other way to see if a certain string is in an array?</p>


JavaScript is in array

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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假设我有这个：var blockedTile = new Array("118", "67", "190", "43", "135", "520");有更多的数组元素，但出于可读性的目的，这些元素很少。无论如何，我可以做一个"for“循环，但它会在你每次点击地图时做500次循环……有没有其他方法可以查看某个字符串是否在...

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