Can anyone exaplain the "0" next "at" inside of the parenthesis?

@Ay__351_eMar 01.2016 — #The code I try:

 <br/>
 &lt;!DOCTYPE html&gt;
 &lt;html&gt;
 &lt;head&gt;
 &lt;style type="text/css"&gt;
 #indeks  td{border:1px solid lime;}
 &lt;/style&gt;
 &lt;/head&gt;
 &lt;body&gt;
 
 
 &lt;button onclick="myFunction()"&gt;Try it&lt;/button&gt;
 
 &lt;p id="demo"&gt;&lt;/p&gt;
 &lt;p id="demo2"&gt;&lt;/p&gt;
 &lt;script&gt;
 function findTheCharacterAtIndex(){
 
 
 }
 function myFunction() {
 var str = "[email protected]";
 var t="&lt;table id='indeks'&gt;&lt;tr&gt;";
 
 <i>	</i>for(var i=0; i&lt;str.length; i++) {
 <i>	</i>t+= "&lt;td id='character"+i+"' &gt; "+str.charAt(i)+"&lt;/td&gt;" ;
 <i>	</i>}
 <i>	</i>t += "&lt;/tr&gt;";
 
 <i>	</i>for(var i=0; i&lt;str.length; i++) {
 <i>	</i>t+= "&lt;td id='index"+i+"' &gt; "+i+"&lt;/td&gt;" ;
 <i>	</i>}
 <i>	</i>t += "&lt;/tr&gt;&lt;/table&gt;";
 
 <i>	</i>var ara="@";
 <i>    </i>var n = str.indexOf(ara);
 <i>	</i>alert("str.indexOf(ara)  :  "+str.indexOf(ara));
 <i>	</i>var el= document.getElementById("demo");
 <i>	</i>el.innerHTML = t;
 <i>	</i>var h = document.getElementById('character'+n);
 <i>	</i>h.style.backgroundColor="pink";
 <i>	</i>var b = document.getElementById('index'+n);
 <i>	</i>b.style.backgroundColor="pink";
 
 <i>	</i>var el2=document.getElementById("demo2");
 <i>	</i>el2.innerHTML =  "indeks of  "+ara +"     is   "+ n ;
 
 <i>	</i>var start=0;
 <i>	</i>var ad = str.substr(start,n);
 <i>	</i>alert( "str.substr(start,n)  :  "+ad);
 <i>	</i>var c;
 <i>	</i>for(var k=start; k&lt;n; k++) {
 <i>	</i>c= document.getElementById("character"+k);
 <i>	</i>c.style.backgroundColor="yellow";
 
 <i>	</i>}
 }
 
 
 //http://www.w3schools.com/jsref/jsref_indexof.asp
 
 //http://www.w3schools.com/jsref/jsref_substr.asp
 
 &lt;/script&gt;
 
 
 &lt;/body&gt;
 &lt;/html&gt;

@rootMar 01.2016 — #Why Ayse? When all you need to do is

To get the console up, press F12 key.

var at =inEmail.indexOf("@");
 var name = inEmail.substr(0,at);
 
 str = "The @ is found at position ["+at+"] and returns the string : "+name;
 console.log("&gt; "+str );
 // alert("&gt; "+str);

( remove the // to get the alert to work.)

to demonstrate the function.

Can anyone exaplain the "0" next "at" inside of the parenthesis?

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Can anyone exaplain the "0" next "at" inside of the parenthesis?

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