tooltip: {
trigger: 'axis',
formatter: function (params) {
var res = `${params[0].name} <br/>`
for (const item of params) {
if (item.value !== 0) {
res += `<span style="background: ${item.color}; height:10px; width: 10px; border-radius: 50%;display: inline-block;margin-right:10px;"></span> ${item.seriesName} :${item.value}<br/>`
}
}
return res
}
},
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