UI 核心（UI Core）
描述：一个相对于数字值的关键代码描述的映射。
jQuery.ui.keyCode
| keyCode | 类型 |
|---|---|
| BACKSPACE | Integer |
| COMMA | Integer |
| DELETE | Integer |
| DOWN | Integer |
| END | Integer |
| ENTER | Integer |
| ESCAPE | Integer |
| HOME | Integer |
| LEFT | Integer |
| PAGE_DOWN | Integer |
| PAGE_UP | Integer |
| PERIOD | Integer |
| RIGHT | Integer |
| SPACE | Integer |
| TAB | Integer |
| UP | Integer |
箭头按键测试。
$( document ).on( "keydown", function( event ) {
switch( event.keyCode ) {
case $.ui.keyCode.LEFT:
console.log( "left" );
break;
case $.ui.keyCode.RIGHT:
console.log( "right" );
break;
case $.ui.keyCode.UP:
console.log( "up" );
break;
case $.ui.keyCode.DOWN:
console.log( "down" );
break;
}
});