For loop with complex variable

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kkakarot

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

Padonak

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>123</title>
<style type="text/css">
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;}
</style>
<script type="text/javascript">
var animals=['cat','dog','fish','bird'];
window.onload=function(){document.getElementById('output').innerHTML=animals;}
</script>
</head>
<body>
<div id="output"></div>
</body>
</html>

Ay__351_e

  

<script type="text/javascript">

// 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 <= 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);

</script>