JS: Retrieve Content Values

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$("p").click(function () { 
  var htmlstring = $(this).html(); // obtain html string from paragraph 
  $(this).text(htmlstring); // overwrite paragraph text with new string value 
}); 

var value1 = $('input#username').val(); // textfield input value 
var value2 = $('input:checkbox:checked').val(); // get the value from a checked checkbox 
var value3 = $('input:radio[name=bar]:checked').val(); // get the value from a set of radio buttons