plainheart commented on issue #13000:
URL:
https://github.com/apache/incubator-echarts/issues/13000#issuecomment-661762915
从代码里看，你在 for 循环体内声明的变量 a，如果想要拼接，应该在 for 循环上边声明变量 a。
```js
formatter: function (obj) {
var value = obj.value;
var a = '';
for(var i = 0; i< 3;i++) {
a += '<div>'+ obj.seriesName + entitiy[i]+'</div>'
}
return a;
}
```
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