echarts自定义悬浮窗样式

 tooltip: {
              trigger: 'item',
              axisPointer: {
                type: "shadow",
              },
              textStyle: {
                fontSize: 30,
                color: "#fff",
              },
              // 自定义弹窗样式
              padding: 0,
              backgroundColor: "transparent",
              formatter: function(params){
　　　　　　　　　　// 设置悬浮窗背景样式，下面的代码是渐变色
　　　　　　　　　　// params，悬浮窗要显示的内容在params参数中查找

                let str = `<div style = " padding: 5px 10px;
                                        background: -webkit-radial-gradient(circle, rgba(0,86,165,0.70),rgba(0,86,165,0.5)) !important;
                                        background: -o-radial-gradient(circle, rgba(0,86,165,0.70),rgba(0,86,165,0.5)) !important;
                                        background: -moz-radial-gradient(circle, rgba(0,86,165,0.70),rgba(0,86,165,0.5)) !important;
                                        background: radial-gradient(circle,rgba(0,86,165,0.70),rgba(0,86,165,0.5)) !important;
                                        no-repeat center center ;
                                        width:100%;height:100%; ">${params.name}<br />${params.percent}%</div>`; // 设置显示内容
                return str;
              }
            },