JavaScript tutorial-String object indexOf | lastIndexOf


JavaScript String object: indexOf | lastIndexOf

You can use the inexOf(string,[start_index]) or the lastIndexOf(string,[start_index]) to find a string in another string. When the target string is found these methods return 0. In contrast, they return -1. the start_index argument is optional. If you don't specify the start_index argument, the indexOf() method will start to search for the target string from the beginning of another string. The difference between the two method is that the indexOf() method searches from the beginning to the end of a string while the lastIndexOf() methods searches from the last the the beginning of a string. In the example below, we use the indexOf() method to search for "JavaScript" string in the "I like JavaScript." string. The two methods are case-sensitive. Finding the string "JavaScript" and "javascript" in "I like JavaScript." string produces different results.

Example:
<html>
<head>
<title>Using indexOf() method</title>

<script language="JavaScript" type="text/javascript">

var Mystr="I like JavaScript.";
var Targetstr="JavaScript";
if(Mystr.indexOf(Targetstr)>0) document.write("Found!");
else document.write("Not found!");


</script>

</head>
<body>
</body>
</html>




Comments

Lyon comment

 Lyon

That is very good tutorials.


2014-01-10



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