better keyboard shortcuts used for shanbay.com

sb.user.js

// ==UserScript==
// @name         sb.js
// @namespace    http:/i.makelove.expert/
// @version      0.1.2
// @description  better keyboard shortcuts used for shanbay.com
// @author       simonmysun
// @match        http://www.shanbay.com/bdc/review/*
// @grant        none
// ==/UserScript==
 
sbContinue = function() {
    $('.continue').click();
};
sbPos = function() {
    $('.known').click();
};
sbNeg = function() {
    $('.unknown').click();
    $('.btn-forget').click();
};
sbPass = function() {
    $('[title="太简单"]').click();
};
$(document).keyup(function(e) {
    switch(e.keyCode) {
    case 74: //j
	sbPos();
	break;
    case 73: // i
	sbNeg();
	break;
    case 89: // y
	sbNeg();
	break;
    case 55: // 7, and 9 by default
	sbPass();
	break;
    case 82: // r
	sbContinue();
	break;
    case 219: // [{
	sbContinue();
	break;
    }
});