//方法 //滑动条 // left: 37, up: 38, right: 39, down: 40, // spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36 var keys = [37, 38, 39, 40]; function preventDefault(e) { e = e || window.event; if (e.preventDefault) e.preventDefault(); e.returnValue