echarts自定義懸浮窗樣式

 tooltip: {
              trigger: 'item',
              axisPointer: {
                type: "shadow",
              },
              textStyle: {
                fontSize: 30,
                color: "#fff",
              },
              // 自定義彈窗樣式
              padding: 0,
              backgroundColor: "transparent",
              formatter: function(params){
　　　　　　　　　　// 設置懸浮窗背景樣式，下面的代碼是漸變色
　　　　　　　　　　// params，懸浮窗要顯示的內容在params參數中查找

                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>`; // 設置顯示內容
                return str;
              }
            },