Echarts multiple data overlay

this.polar = {

title : {
    text: " ",
    x:"center"
},
xAxis: {
    type: "category",
    data: []
},
yAxis: {
    type: "value"
},
series: [
    {
        data: [],
        type: "bar",
        barWidth: "30%" // 
    }
]

}
this.$refs.barCharts.setOption (this.polar, true)

set setOption (this.polar, true), data will still be overlaid, and the data is not entered by push, why?

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Mar.13,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3b408-2c286.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b408-2c286.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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