如果用户按下javascript中的两个键怎么办 [英] How to do something if the user presses two keys in javascript

问题描述

因此，我编写了此脚本，以便您可以在网站上使用键盘快捷键，而我想知道如何执行多个键(即，不只是执行左箭头"键，而是"ctrl +左箭头" .这是我当前的语法:

So I wrote this script so that you can have keyboard shortcuts on your website, and I was wondering how to do multiple keys (ie instead of doing just the "left arrow" key, it would be the "ctrl + left arrow". Here's my current syntax:

var arrow = {
    left: 37,
    up: 38,
    right: 39,
    down: 40
};

function DoSomething() {}

$(document).ready(function() { // requires jQuery
    $("body").keydown(function(event) {
        if(event.keyCode == arrow.left) {
            DoSomething();
        }
    }
}

但是我想做的是这样的:

But what I would like to do is something like this:

var arrow = {
    left: 37,
    up: 38,
    right: 39,
    down: 40
},

ctrl = 17;

function DoSomething() {}

$(document).ready(function() { // requires jQuery
    $("body").keydown(function(event) {
        if(event.keyCode == ctrl && arrow.left) {
            DoSomething();
        }
    }
}

推荐答案

jQuery中提供的事件对象告诉您是否按下了ctrl键.

The event object provided in jQuery tells you if the ctrl key is being pressed.

$(document).on("keydown", function (event) {
    if (event.ctrlKey && event.which === arrow.left) {
        console.log("You pressed left, and control.");
    }
});

演示: http://jsfiddle.net/zcMXR/

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