شرکت طراحی سایت سارگون

var txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var sln = txt.length;

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<p id="demo"></p>

<script>

var txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

document.getElementById("demo").innerHTML = txt.length;

</script>

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26

var str = "Please locate where "locate" occurs!";
var pos = str.indexOf("locate");

==================================

<p id="demo"></p>

<script>

var str = "Please locate where "locate" occurs!";

var pos = str.indexOf("locate");

document.getElementById("demo").innerHTML = pos;

</script>

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7

var str = "Please locate where "locate" occurs!";
var pos = str.lastIndexOf("locate");

====================================

<p id="demo"></p>

<script>

var str = "Please locate where "locate" occurs!";

var pos = str.lastIndexOf("locate");

document.getElementById("demo").innerHTML = pos;

</script>

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21

var str = "Please locate where "locate" occurs!";
var pos = str.indexOf("locate",15);

==================================

<p id="demo"></p>

<script>

var str = "Please locate where "locate" occurs!";

var pos = str.indexOf("locate",15);

document.getElementById("demo").innerHTML = pos;

</script>

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21

var str = "Please locate where "locate" occurs!";
var pos = str.search("locate");

===================================

<p id="demo"></p>

<script>

var str = "Please locate where "locate" occurs!";

var pos = str.search("locate");

document.getElementById("demo").innerHTML = pos;

</script>

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7