Chrome 10：KeyEvent 或类似于 Firefox 的 KeyEvent

Question

在 Firefox 3.6 和 4.0 中，我可以将 KeyboardEvent 的 keyCode 与存储在全局 KeyEvent 对象（这是 DOM3 规范的一部分）内的键的预定义常量进行比较。 KeyEvent 在 Chrome 10.0 中不是全局对象。有没有办法可以在 Chrome 10.0 中访问具有预定义键常量的对象？这甚至实现了吗？

例子：

// This works in firefox 3/4.
// How do I do this in chrome?
if (event.keyCode === KeyEvent.DOM_VK_RETURN) {
    // Do stuff...
} else if (event.keyCode === KeyEvent.DOM_VK_ESCAPE) {
    // Do something else.
}

是的，我知道输入/返回键代码是 13，而转义键代码是 27。

Answer 1

据我所知，Chrome 本身并没有这种功能，但你可以用其他方式定义它：

if (typeof KeyEvent == "undefined") {
    var KeyEvent = {
        DOM_VK_CANCEL: 3,
        DOM_VK_HELP: 6,
        DOM_VK_BACK_SPACE: 8,
        DOM_VK_TAB: 9,
        DOM_VK_CLEAR: 12,
        DOM_VK_RETURN: 13,
        DOM_VK_ENTER: 14,
        DOM_VK_SHIFT: 16,
        DOM_VK_CONTROL: 17,
        DOM_VK_ALT: 18,
        DOM_VK_PAUSE: 19,
        DOM_VK_CAPS_LOCK: 20,
        DOM_VK_ESCAPE: 27,
        DOM_VK_SPACE: 32,
        DOM_VK_PAGE_UP: 33,
        DOM_VK_PAGE_DOWN: 34,
        DOM_VK_END: 35,
        DOM_VK_HOME: 36,
        DOM_VK_LEFT: 37,
        DOM_VK_UP: 38,
        DOM_VK_RIGHT: 39,
        DOM_VK_DOWN: 40,
        DOM_VK_PRINTSCREEN: 44,
        DOM_VK_INSERT: 45,
        DOM_VK_DELETE: 46,
        DOM_VK_0: 48,
        DOM_VK_1: 49,
        DOM_VK_2: 50,
        DOM_VK_3: 51,
        DOM_VK_4: 52,
        DOM_VK_5: 53,
        DOM_VK_6: 54,
        DOM_VK_7: 55,
        DOM_VK_8: 56,
        DOM_VK_9: 57,
        DOM_VK_SEMICOLON: 59,
        DOM_VK_EQUALS: 61,
        DOM_VK_A: 65,
        DOM_VK_B: 66,
        DOM_VK_C: 67,
        DOM_VK_D: 68,
        DOM_VK_E: 69,
        DOM_VK_F: 70,
        DOM_VK_G: 71,
        DOM_VK_H: 72,
        DOM_VK_I: 73,
        DOM_VK_J: 74,
        DOM_VK_K: 75,
        DOM_VK_L: 76,
        DOM_VK_M: 77,
        DOM_VK_N: 78,
        DOM_VK_O: 79,
        DOM_VK_P: 80,
        DOM_VK_Q: 81,
        DOM_VK_R: 82,
        DOM_VK_S: 83,
        DOM_VK_T: 84,
        DOM_VK_U: 85,
        DOM_VK_V: 86,
        DOM_VK_W: 87,
        DOM_VK_X: 88,
        DOM_VK_Y: 89,
        DOM_VK_Z: 90,
        DOM_VK_CONTEXT_MENU: 93,
        DOM_VK_NUMPAD0: 96,
        DOM_VK_NUMPAD1: 97,
        DOM_VK_NUMPAD2: 98,
        DOM_VK_NUMPAD3: 99,
        DOM_VK_NUMPAD4: 100,
        DOM_VK_NUMPAD5: 101,
        DOM_VK_NUMPAD6: 102,
        DOM_VK_NUMPAD7: 103,
        DOM_VK_NUMPAD8: 104,
        DOM_VK_NUMPAD9: 105,
        DOM_VK_MULTIPLY: 106,
        DOM_VK_ADD: 107,
        DOM_VK_SEPARATOR: 108,
        DOM_VK_SUBTRACT: 109,
        DOM_VK_DECIMAL: 110,
        DOM_VK_DIVIDE: 111,
        DOM_VK_F1: 112,
        DOM_VK_F2: 113,
        DOM_VK_F3: 114,
        DOM_VK_F4: 115,
        DOM_VK_F5: 116,
        DOM_VK_F6: 117,
        DOM_VK_F7: 118,
        DOM_VK_F8: 119,
        DOM_VK_F9: 120,
        DOM_VK_F10: 121,
        DOM_VK_F11: 122,
        DOM_VK_F12: 123,
        DOM_VK_F13: 124,
        DOM_VK_F14: 125,
        DOM_VK_F15: 126,
        DOM_VK_F16: 127,
        DOM_VK_F17: 128,
        DOM_VK_F18: 129,
        DOM_VK_F19: 130,
        DOM_VK_F20: 131,
        DOM_VK_F21: 132,
        DOM_VK_F22: 133,
        DOM_VK_F23: 134,
        DOM_VK_F24: 135,
        DOM_VK_NUM_LOCK: 144,
        DOM_VK_SCROLL_LOCK: 145,
        DOM_VK_COMMA: 188,
        DOM_VK_PERIOD: 190,
        DOM_VK_SLASH: 191,
        DOM_VK_BACK_QUOTE: 192,
        DOM_VK_OPEN_BRACKET: 219,
        DOM_VK_BACK_SLASH: 220,
        DOM_VK_CLOSE_BRACKET: 221,
        DOM_VK_QUOTE: 222,
        DOM_VK_META: 224
    };
}