animate 草案.....省去 cssHook 方法

$('#box_1').maya({
                left: '80%'
            }, {
                    duration: 800
                }, function () {
                    // init-fun
                    // 取得與目標相同的單位
                    // 如 left: px or %
                    // 若單位不同，程式將自動檢視並不執行
                    return {
                        left: $(this).css('left')
                    };
                }, function (initData, finalData, ratio) {
                    // 每個 tick 會執行
                    // 此函式將隱身在後面
                    var initLeft = parseFloat(initData.left);
                    var final_left = finalData.left;
                    var current_left = (final_left - initLeft) * ratio + left - initLeft;

                    $(this).css({
                        left: current_left + (單位)
                    });
                });