How to determine whether the Enter key is pressed in jquery

How jquery determines whether the Enter key is pressed: Use the keynum method to determine, the code is [$('#textBox').keypress(function(event){var keynum = (event.keyCode ?event. keyC】.

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, thinkpad t480 computer.

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How jquery determines whether the Enter key is pressed:

In jquery, Use the following method to determine whether Enter is pressed

$('#textBox').keypress(function(event){  
    var keynum = (event.keyCode ? event.keyCode : event.which);  
    if(keynum == '13'){  
        alert('You pressed a "Enter" key in textbox');    
    }  
});  
  
$(document).keypress(function(event){  
    var keynum = (event.keyCode ? event.keyCode : event.which);  
    if(keynum == '13'){  
        alert('You pressed a "Enter" key in somewhere');      
    }  
});

Note that Netscape/Firefox/Opera supports event.which to obtain the ASCII code of the key, while IE Both event.keyCode and event.which are supported.

Finally, the process of obtaining keynum can also be judged using if.

Supplement: jQuery gets Ctrl Enter Shift Enter

The keyboard event has been corrected in jQuery. When calling the function, you can pass in the event. The key code can be found through the event's which. However, when there is a combination When pressing the key, you need to pay attention.

For example, Ctrl Enter, although e.ctrlKey is used, the key code of the Enter key is not always 13.

In FireFox, judgeCtrl Enter is e.ctrlKey && e.which == 13

And in IE6, it is judged that Ctrl Enter is e.ctrlKey && e.which == 10

Example:

$(document).keypress(function(e){
        if(e.ctrlKey && e.which == 13 || e.which == 10) { 
                $("#btn").click();
        } else if (e.shiftKey && e.which==13 || e.which == 10) {
                $("#btnv").click();
        }          
 })

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