我会认为Enter是可打印的,顺便说一下,这个功能认为它是.如果您不同意,您可以修改它,以将该事件的哪个或keyCode属性设置为13来过滤掉按键.

function isCharacterKeyPress(evt) {
    if (typeof evt.which == "undefined") {
        // This is IE,which only fires keypress events for printable keys
        return true;
    } else if (typeof evt.which == "number" && evt.which > 0) {
        // In other browsers except old versions of WebKit,evt.which is
        // only greater than zero if the keypress is a printable key.
        // We need to filter out backspace and ctrl/alt/Meta key combinations
        return !evt.ctrlKey && !evt.MetaKey && !evt.altKey && evt.which != 8;
    }
    return false;
}

var input = document.getElementById("your_input_id");
input.onkeypress = function(evt) {
    evt = evt || window.event;

    if (isCharacterKeyPress(evt)) {
        // Do your stuff here
        alert("Character!");
    }
});