ECharts 折线图折点上方数值不显示的问题

关于折线图折点上方不显示值得问题，在网上找了很多，基本都是加下面的属性，

  "label": {"normal": {"fontSize": 25,"show": true, //折点显示数值,"position": "top"}},

但这样，特么的只有鼠标指上去才显示数值，跟不显示有什么区别？也不知道自己测试了没有，就往出发，反正各种不好使，最后弄清是因为少了一个属性，“symbolSize”，具体看下方代码及注释！！如有其他见解请指出哈!

var option = {"title": {"text": "折线图"},"tooltip": {"trigger": "axis"},"legend": {"data": ["日产量"]},"grid": {"left": "3%","right": "4%","bottom": "3%","containLabel": true},"toolbox": {"feature": {"saveAsImage": {}}},"xAxis": {"axisLabel": {"show": true,"textStyle": {"color": "#c3dbff",//X轴字体颜色"fontSize": 25   //X轴字体大小},// "interval": 0,//"rotate": -60 //X轴倾斜度},"axisLine": {"lineStyle": {"color": "#315070"}},"type": "category","boundaryGap": false,"data": ["挺胸左放胯","挺胸右放胯","再来，挺胸左放胯","挺胸右放胯","加快!胸胯,胸胯,胸胯"]},"yAxis": {"type": "value"},"series": [{"name": "邮件营销","type": "line","stack": "总量","label": {"normal": {"fontSize": 25,"show": true, //折点显示数值,"position": "top"}},"itemStyle": {"normal": {"color": "#00FF00",//折线区域的颜色"lineStyle": {"color": "#0d427e" //折线的颜色}}},"areaStyle": {},"symbolSize": 10,//折线点的大小，必须加这个，折点上方的数值才会显示"data": [300,100,500,400,600]}]
}

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