Difference between private, public and static variable?

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Advantages & Disadvavtages of Java Script? Advantages & Disadvantages of CGI Scripting? Structure of Java Script? Commands of Java Script? HTML Basic Reviews?

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i want to display time using hidden variable in a page,but when i click button that page that hidden variable loosing its value.i m sending the code also. <script type="text/javascript" language="javascript"> var tick=0; window.onload = function() { //debugger if(document.getElementById("hdnTicker").value != "") tick = parseInt(document.getElementById("hdnTicker").value); setInterval("Timer()",1000); } function Timer() { //debugger document.getElementById("hdnTicker").value = tick++; //alert(document.getElementById("hdnTicker").value); document.getElementById("lblTimeSpent").innerHTML = "0." + tick; if(tick == 30) { //message or redirect to result window alert('time is out'); //clearTimeout(); } } </script> <form id="form1" runat="server"> <div> <table> <tr> <td> <asp:Label ID="lblTimeSpent" runat="server" Visible="true" ForeColor="Blue" ></asp:Label> </td> <td> <%-- <asp:textbox EnableViewState="true" id="hdnTicker" runat="Server" style="visibility:hidden"></asp:textbox>--%> </td> </tr> <tr> <td> <asp:Button ID="btn" runat="server" Text="hi" OnClick="btn_Click" Height="30px" Width="60px" /> </td> </tr> </table> <%--<asp:HiddenField ID="txt" runat="server" Visible="true" />--%> </div> </form> <input type="hidden" id="hdnTicker" name="hdnTicker" enableviewstate="true" runat="server" />

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What is output of “20” + 20 + 20 and “20” + ( 20 + 20)? In javascript?

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Is javascript insecure?

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Entire content of a JavaScript source file in a function block?

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Difference between window, document, and screen in Javascript?

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What are JavaScript Data Types?

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What is meant by vanilla javascript?

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Why are callbacks used?

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List some data types supported by javascript?

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What are ‘settimeout()’?

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