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For loop with complex variable

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Jul 02.2013

I need to see output as cat,dog,fish,bird what syntax I suppose to use.

<script>
a1=cat;
a2=dog;
a3=fish;
a4=bird;
for (var i = 1;i <= 4; i++){
document.writeln(ai);
}
</script>

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JavaScript

2 Comments(s) ↴

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@PadonakJul 02.2013 — <i>
</i>&lt;!DOCTYPE HTML&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta http-equiv="content-type" content="text/html; charset=utf-8" /&gt;
&lt;title&gt;123&lt;/title&gt;
&lt;style type="text/css"&gt;
body{color:#000;background-color:#fff;font-family:'Bookman Old Style',Georgia,Verdana;font-size:14px;text-align:center;font-weight:bold;margin-top:300px;}
&lt;/style&gt;
&lt;script type="text/javascript"&gt;
var animals=['cat','dog','fish','bird'];
window.onload=function(){document.getElementById('output').innerHTML=animals;}
&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div id="output"&gt;&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;
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@Ay__351_eJul 02.2013 —  <br/>
&lt;script type="text/javascript"&gt;

// http://www.w3schools.com/jsref/jsref_obj_string.asp
// http://www.w3schools.com/jsref/jsref_slice_string.asp
// http://www.w3schools.com/jsref/jsref_eval.asp

var a1 = 'cat';
var a2 = 'dog';
var a3 = 'fish';
var a4 = 'bird';
var str = '';

for (var i = 1;i &lt;= 4; i++){

str = str + eval('a'+i) + ',';

}

alert(str); // cat,dog,fish,bird,

str = str.slice(0, str.length-1);

alert(str); // cat,dog,fish,bird

document.write(str);

&lt;/script&gt;
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