平滑的过渡效果没显示

$('#nextBtn').mouseenter(()=>{

            if(intIntedex===listlength){

                intIntedex=0;

                $content.css({

                    "transition":`none`,

                    "transform":`translateX(-${outerWidth*intIntedex}px)`

                })

            }

        })

        $('#nextBtn').click(()=>{

            intIntedex++;

            $content.css({

                'transition':`tranform ${transitionTime}s ease`,

                'transform':`translateX(-${outerWidth*intIntedex}px)`

            })

            intIntedex === listlength?intIntedex=0:'';

        })