echarts.js柱状图显示文字及鼠标悬停显示文字

  var dom = document.getElementById('salarychart');
                    var myChart = echarts.init(dom, null, {
                        renderer: 'canvas',
                        useDirtyRect: false
                    });
                    var app = {};
                    var option;
                    var cabinetNames = [];
                    var boxnumbers = [];
                    for (var i = 0; i < data.length; i++) {
                        cabinetNames.push(data[i].cabineName);
                        boxnumbers.push(data[i].number);
                    }
                    option = {
                        xAxis: {
                            type: 'category',
                            data: cabinetNames
                        },
                        yAxis: {
                            type: 'value'
                        },
                        series: [
                            {
                                data: boxnumbers,
                                type: 'bar',
                                itemStyle: {
                                    normal: {
                                        label: {
                                            show: true,//设置显示文字
                                            position:'top'
                                        }
                                    }
                                }
                            }
                        ],
                        tooltip: {//鼠标悬浮提示数据
                            trigger:'axis'
                        }
                    };

                    if (option && typeof option === 'object') {
                        myChart.setOption(option);
                    }

                    window.addEventListener('resize', myChart.resize);
                }