Jquery ctrl+key快捷键实现 How to create Ctrl+Key shortcuts in Javascript

兼容ie6-ie8/Chrome/Firefox

/**
 * Ctrl+Key shortcuts
 * @param {string} key,etc:'A'
 * @param {function} callback:event callback
 * @param {array} args:callback's args
 */
$.ctrl = function(key, callback, args){
    var isCtrl = false;
    $(document).keydown(function(e){
        if (e.which === 17) 
            isCtrl = true;
        if (e.which === key.charCodeAt(0) && isCtrl === true) {
            callback.apply(this, args);
            return false;
        }
    }).keyup(function(e){
        if (e.which === 17) 
            isCtrl = false;
    });
};