Echarts tooltip加上单位并带着图例颜色

原文地址：https://www.cnblogs.com/cxl-/p/14487874.html

/** 

params[i].marker:图例代码

 **/
tooltip: {
            trigger: 'axis',
            formatter: function (params) {
                var relVal = params[0].name;
                for (var i = 0, l = params.length; i < l; i++) {
                    relVal += '
' + params[i].marker + params[i].seriesName + ' : ' + params[i].value + '%'
                }
                return relVal;
            }

        },