echarts 鼠标悬浮提示

            formatter: function (params)//数据格式
                    {
                        var relVal = params[0].name + "<br/>";
                        relVal += params[0].seriesName + ' : ' + params[0].value + "<br/>";
                        relVal += params[1].seriesName + ' : ' + params[1].value + "<br/>";
                        relVal += params[2].seriesName + ' : ' + params[2].value + "%";
                        return relVal;
                    }

 

引用：https://blog.youkuaiyun.com/alex81320/article/details/53886571/