apache / apache/echarts

如何获取引力导图中节点的位置坐标

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Description

### Version
4.9.0

### Steps to reproduce
设置layout:force的引力导图,怎么获取其中节点的坐标,我注册了一个onclick事件,点击节点,在这个回调中怎么获取当前点击的节点的位置(坐标):
echart.on('click', function (params) {
var option = echart.getOption();
console.log(params)
}

### What is expected?
点击节点能够或者节点的位置坐标

### What is actually happening?
不知道怎么获取节点坐标

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