问题描述
如何在Javascript和/或jQuery中将函数绑定到左右箭头键？我查看了jQuery的js-hotkey插件（包含内置的绑定函数以添加一个参数来识别特定的键），但它似乎不支持箭头键。
How do I go about binding a function to left and right arrow keys in Javascript and/or jQuery? I looked at the js-hotkey plugin for jQuery (wraps the built-in bind function to add an argument to recognize specific keys), but it doesn't seem to support arrow keys.
推荐答案
$(document).keydown(function(e) {
switch(e.which) {
case 37: // left
break;
case 38: // up
break;
case 39: // right
break;
case 40: // down
break;
default: return; // exit this handler for other keys
}
e.preventDefault(); // prevent the default action (scroll / move caret)
});
将箭头键的自定义代码放在相应的案例和中断行。
Put your custom code for the arrow keys between the corresponding case and break lines.
由jQuery规范化，因此适用于所有浏览器。对于纯JavaScript方法，请将前两行替换为：
e.which is normalized by jQuery, so it works in all browsers. For a pure javascript approach, replace the first two lines with:
document.onkeydown = function(e) {
e = e || window.event;
switch(e.which || e.keyCode) {
（编辑2017）
如果你觉得很花哨，你可以使用而不是 e.which 或 e.keyCode 现在。 e.key 正在成为推荐标准，允许您检查字符串：'ArrowLeft'，'ArrowUp'，'ArrowRight'，'ArrowDown'。新的浏览器本身支持它，。
(edit 2017)
If you feel fancy, you can use e.key instead of e.which or e.keyCode now. e.key is becoming a recommended standard, allowing you to check against strings: 'ArrowLeft', 'ArrowUp', 'ArrowRight', 'ArrowDown'. New browsers support it natively, check here.
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