evt.preventDefault（）的反义词是什么？

evt.preventDefault();

$(\'form\').submit( function(ev) {
     ev.preventDefault();
     //later you decide you want to submit
     $(this).unbind(\'submit\').submit()
});

function(evt) {evt.preventDefault();}

function(evt) {return true;}

click

<a href=\"http://google.com/\" class=\"myevent\">Click me</a>

$(\'a.myevent\').click(function(event) {
    event.preventDefault();

    // Do my commands
    if( myEventThingFirst() )
    {
      // then redirect to original location
      window.location = this.href;
    }
    else
    {
      alert(\"Couldn\'t do my thing first\");
    }
});

window.location = this.href;

event.preventDefault(); //or event.returnValue = false;

event.returnValue = true;

$(\"$theform\").submit(function(e) {
    e.preventDefault();
    var $this = $(this);
    $.ajax(\'/path/to/script.php\',
        {
        type: \"POST\",
        data: { value: $(\"#input_control\").val() }
    }).done(function(response) {
        $this.unbind(\'submit\').submit();
    });
});

$(\"#submit\").click(function(e){ 

   e.preventDefault();

  -> block the click of the sumbit ... do what you want

$(\"#submit\").unbind(\'click\').click(); // the html click submit work now !

});

document.getElementById(\"foo\").onsubmit = function(e) {
    if (document.getElementById(\"test\").value == \"test\") {
        return true;
    } else {
        e.preventDefault();
    }
}

<form id=\"foo\">
    <input id=\"test\"/>
    <input type=\"submit\"/>
</form>

event.preventDefault()

event.preventDefault()

;(function($, window, document, undefined)) {

    $(function() {
        // By default deny the submit
        var allowSubmit = false;

        $(\"#someform\").on(\"submit\", function(event) {

            if (!allowSubmit) {
                event.preventDefault();

                // Your code logic in here (maybe form validation or something)
                // Then you set allowSubmit to true so this code is bypassed

                allowSubmit = true;
            }

        });
    });

})(jQuery, window, document);

event.preventDefault

<a href=\"https://www.google.com.br\" target=\"_blank\" id=\"link\">Google</a>

<script type=\"text/javascript\">
    $(document).ready(function() {
        $(\"#link\").click(function(e) {

            // Prevent default action
            e.preventDefault();

            // Here you\'ll put your code, what you want to execute before default action
            alert(123); 

            // Prevent infinite loop
            $(this).unbind(\'click\');

            // Execute default action
            e.currentTarget.click();
        });
    });
</script>

$(\"body\").on(\'touchmove\', function(e){ 
    e.preventDefault(); 
});

$(\"body\").unbind(\"touchmove\");

.createEvent()

function simulateClick() {
  var evt = document.createEvent(\"MouseEvents\");
  evt.initMouseEvent(\"click\", true, true, window,
    0, 0, 0, 0, 0, false, false, false, false, 0, null);
  var cb = document.getElementById(\"checkbox\"); 
  var cancelled = !cb.dispatchEvent(evt);
  if(cancelled) {
    // A handler called preventDefault
    alert(\"cancelled\");
  } else {
    // None of the handlers called preventDefault
    alert(\"not cancelled\");
  }
}

$(\'#foo\').bind(\'click\', function() {
      alert($(this).text());
});

$(\'#foo\').trigger(\'click\');

$( selector ).on(\"submit.my-namespace\", function( event ) {
    //prevent the event
    event.preventDefault();

    //cache the selector
    var $this = $(this);

    if ( my_condition_is_true ) {
        //when \'my_condition_is_true\' is met, the binding is removed and the event is triggered again.
        $this.off(\"submit.my-namespace\").trigger(\"submit\");
    }
});

var defaultEvent=evt.target;

if(\"true\")
{
//activate default event..
location.href(defaultEvent);
}

location.href = this.href;

jQuery(\'a\').click(function(e) {
    location.href = this.href;
});

<a onclick=\"return clickEvent(event);\" href=\"/contact-us\">

clickEvent()

function clickEvent(event) {
    event.preventDefault();
    // do your thing here

    // remove the onclick event trigger and continue with the event
    event.target.parentElement.onclick = null;
    event.target.parentElement.click();
}

$(\'a\').bind(\'click\', function(e) {
  e.stopPropagation();
});

event.preventDefault(); to disable the event.


event.preventDefault = false;