Eff Stop Traversing Eq Jq Sel Empty Misc Deferred Rejectwith Misc Iswindow Traversing Parents Jq Sel Not Jquery Plugin Password Validation Event Namespace Jquery Events Prop Cssnumber Jq Event Timestamp Misc Parsehtml Misc Isemptyobject Ajax Serializearray Sel Input Text Event Preventindex Event Change Sel Firstoftype Eff Fadein Jq Sel Attribute Event Keypress Prop Jquery Fx Interval Sel Attribute Contains Value Jquery Chaining Event Contextmenu Misc Extend Event Proxy Jquery Ref Ajax Misc Deferred Then Misc Deferred Rejectwith Misc Callbacks Disable Sel Input Checked Html Unwrap Prop Context Misc Promise Event Mouseleave Jquery Selectors Event Unbind Misc Deferred Reject Sel Input Checkbox Jquery Install Html Csshooks Misc Type Jquery Css Classes Jquery Dom Add Traversing Prev Event Focusout Html Toggleclass Sel Contains Misc Isxmldoc Html Wrapall Traversing Closest Html Wrapinner Traversing Has Jquery Callback Html Attr Jquery Plugin Treeview Misc Deferred Always Traversing Prevuntil Misc Isarray Event Focusin Sel Hidden Jquery Ref Prop Sel Lastchild Sel Previous Next Event Mouseup Event Currenttarget Traversing Add Misc Unique Ajax Ajaxstart Sel Onlychild Traversing Parent Sel Multiple Classes Event Live Event Delegate Traversing Filter Misc Callbacks Fire Jquery Plugin Message Jquery Dom Get Jquery Traversing Ancestors Event Ispropagationstopped Jq Sel All Sel Input File Misc_Data Misc Callbacks Fired Html Append Sel Input Image Event On Ajax Get Jq Event Relatedtarget Jquery Stop Html Removeclass Sel Last Jquery Css Event Isdefaultprevented Jquery Animate Misc Pushstack Misc Globaleval Sel Lastoftype Sel Eq Event_Metakey Ajax Post Event One Event Focus Jq Sel Lang Sel Input Password Sel Nthlastchild Sel Input Reset Ajax Ajaxsend Misc Param Css Height Eff Fadetoggle Misc Now Jq Event Target Misc Map Html Outerheight Sel Attribute Equal Value Jq Sel Firstchild Event Load Sel Input Selected Eff Slidetoggle Misc Deferred Isresolved Misc Deferred Fail Sel Animated Event Submit Event Isimmediatepropagationstopped Misc Fn Extend Misc Callbacks Firewith Misc Merge Html Removeattr Traversing Find Ajax Ajaxstop Traversing Siblings Jquery Ref Effects Ajax Ajax Eff Animate Jq Sel Element Html Replaceall Prop Length Eff Fadeout Misc Callbacks Empty Sel Parent Descendant Misc Hasdata Event Mouseout Eff Toggle Event Off Sel Input Submit Eff Delay Misc_Each Sel Has Jquery Ref Html Jquery Plugin Prettydate Sel Input Disabled Jquery Tutorial Misc Isplainobject Traversing Children Eff Dequeue Misc Get Misc Trim Html Prependto Jq Sel Class Misc Jquery Readyexception Sel Attribute Notequal Value Event Ready Sel Multiple Elements Event Undelegate Sel Gt Traversing Parentsuntil Html Wrap Html Before Jquery Ajax Load Css Position Traversing First Traversing Each Misc Deferred Pipe Misc Deferred Promise Jquery Plugin Accordion Misc Deferred State Html Innerheight Event Mousedown Misc When Sel Nthchild Html Hasclass Html Clone Sel Input Radio Html Toggleclass Event Bind Jquery Dimensions Sel Nthlastoftype Event Scroll Jquery Plugin Validate Misc Deferred Notify Eff Queue Jquery Plugin Tooltip Html Innerwidth Ajax Ajaxcomplete Traversing Next Sel Nthoftype Misc Deferred Isrejected Misc Isnumeric Event Mouseover Misc Deferred Resolvewith Prop Jquery Fx Off Ajax Getscript Jquery Ref Traversing Html Prop Jquery Ajax Get Post Event Error Sel Parent Misc Deferred Resolvewith Sel Onlyoftype Event Select Css Scrolltop Html Detach Sel Lt Sel Attribute End Value Prop Jquery Ajax Ajaxsetup Event Keyup Sel Odd Css Offsetparent Sel Parent Child Event Pagey Prop Jquery Support Jquery Syntax Jquery Examples Jquery Plugin Autocomplete Misc Removedata Html Val Misc Index Jq Sel Root Sel Previous Siblings Misc Isfunction Traversing Slice Event Holdready Jq Sel Focus Sel Input Event Keydown Jquery Fade Eff Finish Sel Input Button Jquery Traversing Siblings Traversing Prevall Eff Clearqueue Sel Visible Traversing Nextall Misc Callbacks Remove Misc Callbacks Has Traversing Not Misc Parsexml Jq Sel Id Traversing Contents Html Appendto Event Trigger Event Mousemove Sel Attribute Beginning Value Ajax Ajaxsuccess Css Scrollleft Css Width Misc Callbacks Add Traversing Offsetparent Html Insertbefore Misc Data Jquery Ref Selectors Misc Jquery Speed Ajax Load Misc Callbacks Locked Sel Multipleattribute Equal Value Event Dblclick Misc Makearray Jq Event Type Css Css Eff Hide Jquery Intro Eff Fadeto Misc Deferred Resolve Jquery Slide Eff Show Html Escapeselector Event Stoppropagation Event Die Eff Slideup Event Stopimmediatepropagation Misc Grep Traversing Is Jquery Traversing Jquery Hide Show Misc Noop Html Remove Misc Deferred Done Misc Uniquesort Sel Header Event Unload Sel Even Eff Slidedown Html Replacewith Jquery Ajax Intro Misc Browser Misc Callbacks Lock Misc Inarray Traversing Parentsuntil Html Empty Jq Event Currenttarget Event Hover Jquery Dom Set Misc Jquery Htmlprefilter Html Insertafter Html Html Misc Deferred Notifywith Html Addclass Index Misc Callbacks Disabled Event Which Html After Sel Attribute Prefix Value Misc Size Jquery Cookie Plugin Ajax Getjson Html Removeprop Ajax Ajaxerror Sel Class Jquery Noconflict Jquery Ref Events Misc Each Html Escapeselector Event Resize Css Offset Jq Sel Target Html Outerwidth Event Blur Ajax Param Misc Noconflict Html Prepend Event Mouseenter Jquery Ref Misc Misc Deferred Progress Html Text Traversing Last Sel First Misc Jquery Sub Event Click Sel Attribute Contains String Value Event Toggle Jquery Traversing Descendants Ajax Serialize Event Triggerhandler Misc Parsejson Sel Input Enabled Misc Jquery Deferred Misc Callbacks Misc Contains Event Data Traversing Nextuntil Event Pagex Event Result Misc Toarray Jquery Traversing Filtering Jquery Dom Remove Event Delegatetarget Sel Firstchild

<p>Result: </p>
<script>
$(function () { 
    var $p = jQuery( "p" ), p = $p[ 0 ];
    $p.append( jQuery.hasData( p ) + " " ); // false
    $.data( p, "testing", 123 );
    $p.append( jQuery.hasData( p ) + " " ); // true
    $.removeData( p, "testing" );
    $p.append( jQuery.hasData( p ) + " " ); // false
    $p.on( "click", function() {} );
    $p.append( jQuery.hasData( p ) + " " ); // true
    $p.off( "click" );
    $p.append( jQuery.hasData( p ) + " " ); // false
})
</script>