echarts自定义tooltip以及无数据显示暂无数据

var myChart_back_responsibility_module = echarts.init(document.getElementById("back_responsibility"));
var call_back_responsibility_dict = eval("(" + $("#call_back_responsibility_dict").val() + ")");
var back_responsibility = [];
var back_times = [];
var version_name = [];

for (var back_obj in call_back_responsibility_dict) {
    back_responsibility.push(back_obj);
    back_times.push(call_back_responsibility_dict[back_obj]["back_count"]);
}

// title显示暂无数据
if (back_responsibility.length === 0) {
    var show_title = {
            text: '暂无数据',
            x: 'center',
            y: 'center',
            textStyle: {
                color: '#65ABE7',
                fontWeight: 'normal',
                fontSize: 16
               }
}
}else {
    var show_title = {
        text: '责任人-打回数',
        left: 'center',
    }
}

var option_back_responsibility = {
    title: show_title,
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'shadow',
        },
        enterable: true,
        formatter: function (params) {
            //x轴名称
            var name = params[0].name;
            //值
            var value = Number(params[0].value);
            var valueFilter = '<i style="</i>' + "打回数：" + '<span style="font-weight: bolder">' + Number(params[0].value).toString() + '</span>' + '</br>';
            if (value < 100) {
                return name + '</br>' + params[0].marker + valueFilter + '</br>' + '<span style="font-weight: bolder">' + '打回迭代：' + '</span>' + '</br>' + getBackInfo(params, name, call_back_responsibility_dict);
            }

        },
　　　　// 自定义tooltip卡片的位置
        position: function (point, params, dom, rect, size) {
            var x = 0; // x坐标位置
            var y = 0; // y坐标位置

            // 当前鼠标位置
            var pointX = point[0];
            var pointY = point[1];

            // 提示框大小
            var boxWidth = size.contentSize[0];
            var boxHeight = size.contentSize[1];

            // boxWidth > pointX 说明鼠标左边放不下提示框
            x = pointX - boxWidth;

            // boxHeight > pointY 说明鼠标上边放不下提示框
            y = pointY - boxHeight;

            return [x, y];

        }
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    xAxis: {
        type: 'value',
        interval: 1
    },
    yAxis: {
        type: 'category',
        data: back_responsibility,
        name: "责任人"
    },
    series: [
        {
            name: '打回数',
            type: 'bar',
            data: back_times,
        }
    ],

};
myChart_back_responsibility_module.setOption(option_back_responsibility);

function getBackInfo(params, name, data) {
    if (data[name]) {
        var new_id = [];
        var version_name_list = data[name]["back_info"]["version_name"];
        var process_id_list = data[name]["back_info"]["process_id"];
        for (var i = 0; i < process_id_list.length; i++) {
            new_id.push(params[0].marker + "<a href=\"/haohan/get_process_detail/?show_back=1&process_id=" + process_id_list[i].toString() + "\"target=\"_blank\">" + version_name_list[i] + "</a></br>")
        }
        return new_id.toString().replace(",", " ")
    }

}