//single line comment
for(var i=0; i<2; i++) {
  alert(i);
}
/*
block comments
//while loop running twice
showing alert
*/
var i=0;
while(i<2)
  alert(i);

  

    

      

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$(document).ready(function() { 
    $('#demo2').click(function() { 
        $.blockUI({ css: { 
            border: 'none', 
            padding: '15px', 
            backgroundColor: '#000', 
            '-webkit-border-radius': '10px', 
            '-moz-border-radius': '10px', 
            opacity: .5, 
            color: '#fff' 
        } }); 
 
        setTimeout($.unblockUI, 2000); 
    }); 
});