释放CTRL-F时如何检测CTRL键的“ key up”事件？

Question

I am trying to detect the "key up" event of the CTRL key when releasing CTRL+F in the browser. I have tried this:

    $(document).keyup(function(e){
        if (e.ctrlKey){ // note that I'm not even checking for the F key here
            console.log("CTRL up");
        }
    });

but it doesn't work, the event is not triggered. How can I do this?

Answer 1

If you're using jQuery, you can always do:

$(document).keydown(function(e) {
  if(e.ctrlKey && (e.keyCode === 70 || e.keyCode === 102)) // f or F
    alert("Ctrl+F was pressed!!");
});

from your code:

• never use keyup , by that time the browser already fired its own event and the event will never be bubble down to the document again, at least you should use keydown
• you will never be able to override the browser behavior, in this case, bring the search input box

Answer 2

e.ctrlKey returns false on keyUp event and true on keyDown. You can test (e.keyCode === 17) condition.

Answer 3

You were very close. I always find it easiest to output the e variable in order to see exactly what's going on and filter down from there. See my jsfiddle for a working example.

$(document).keyup(function (e) {
  if(e.originalEvent.key == 'Control') {
    console.log("CTRL keyup event.");
  }
});