缩放时 circle 不消失echarts scatter配置项内容和展示

      var data = [
[0,0,1997096869,'Australia',1990],[31163,77.4,27662440,'Canada',1990],[1516,68,1154605773,'China',1990],[13670,74.7,10582082,'Cuba',1990],[28599,75,4986705,'Finland',1990],[29476,77.1,56943299,'France',1990],[31476,75.4,78958237,'Germany',1990],[28666,78.1,254830,'Iceland',1990],[1777,57.7,870601776,'India',1990],[29550,79.1,122249285,'Japan',1990],[2076,67.9,20194354,'North Korea',1990],[12087,72,42972254,'South Korea',1990],[24021,75.4,3397534,'New Zealand',1990],[43296,76.8,4240375,'Norway',1990],[10088,70.8,38195258,'Poland',1990],[19349,69.6,147568552,'Russia',1990],[10670,67.3,53994605,'Turkey',1990],[26424,75.7,57110117,'United Kingdom',1990],[37062,75.4,252847810,'United States',1990]
];

option = {
    dataZoom: [{
            type: 'inside'
        }],

xAxis: {
    splitLine: {
        lineStyle: {
            type: 'dashed'
        }
    },
    scale: true
},
yAxis: {
    splitLine: {
        lineStyle: {
            type: 'dashed'
        }
    },
    scale: true
},
animationDuration: 2000,
series: [{
    name: '1990',
    data: data,
    type: 'scatter',
    symbolSize: function (data) {
        return Math.sqrt(data[2]) / 5e2;
    },

}]
};