dojo/keys键盘按键

dojo/keys定义常用的键盘键值表，是常量。

简介：通常用法为：在按键事件中(onKeyDown(event))，可以获取到按键值(event.charOrCode)，通过dojo/keys判断是否为需要的按键。

属性：

BACKSPACE: 8,

TAB: 9,

CLEAR: 12,

ENTER: 13,

SHIFT: 16,

CTRL: 17,

ALT: 18,

META: has("webkit") ? 91 : 224,        // the apple key on macs

PAUSE: 19,

CAPS_LOCK: 20,

ESCAPE: 27,

SPACE: 32,

PAGE_UP: 33,

PAGE_DOWN: 34,

END: 35,

HOME: 36,

LEFT_ARROW: 37,

UP_ARROW: 38,

RIGHT_ARROW: 39,

DOWN_ARROW: 40,

INSERT: 45,

DELETE: 46,

HELP: 47,

LEFT_WINDOW: 91,

RIGHT_WINDOW: 92,

SELECT: 93,

NUMPAD_0: 96,

NUMPAD_1: 97,

NUMPAD_2: 98,

NUMPAD_3: 99,

NUMPAD_4: 100,

NUMPAD_5: 101,

NUMPAD_6: 102,

NUMPAD_7: 103,

NUMPAD_8: 104,

NUMPAD_9: 105,

NUMPAD_MULTIPLY: 106,

NUMPAD_PLUS: 107,

NUMPAD_ENTER: 108,

NUMPAD_MINUS: 109,

NUMPAD_PERIOD: 110,

NUMPAD_DIVIDE: 111,

F1: 112,

F2: 113,

F3: 114,

F4: 115,

F5: 116,

F6: 117,

F7: 118,

F8: 119,

F9: 120,

F10: 121,

F11: 122,

F12: 123,

F13: 124,

F14: 125,

F15: 126,

NUM_LOCK: 144,

SCROLL_LOCK: 145,

UP_DPAD: 175,

DOWN_DPAD: 176,

LEFT_DPAD: 177,

RIGHT_DPAD: 178,

使用方法：

switch(charOrCode){

      case keys.LEFT_ARROW:

      case keys.UP_ARROW:

      case keys.DOWN_ARROW:

      case keys.RIGHT_ARROW:

        output = "You pressed an arrow key";

        break;

      case keys.BACKSPACE:

        output = "You pressed the backspace";

        break;

      case keys.TAB:

        output = "You pressed the tab key";

        break;

      case keys.ESCAPE:

        output = "You pressed the escape key";

        break;

      default:

        output = "You pressed some other key";

    }