Inside echarts. My demand now is that there are 16 curves, and 3 curves are displayed by default, that is, how to achieve the first three curves?

inside echarts. My demand now is that there are 15 curves, and 3 curves are displayed by default, that is, how to achieve the first three curves?
_ this.opios contains the names of my 16 curves
I know to use the optionFH.legend.selected method, but how do I do it? (including cases where there may be no data in the first 10 of the 15 items)

clipboard.png 

        this.optionFH.legend.selected={
                      "xx":true,
                      "xxx":true,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false,
                 "xxx":false
            }

that"s what I wrote before. But now there may be no data in the middle, according to the order of the first two with data and the third with data default display curve, how to achieve?

Html5 javascript
Mar.25,2021 
var selected = {}, i = 0;
data.forEach(function(item){
    selected['your series name'] = item.length > 0 && PPi && i < 4
})
//series16series

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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-64f5-1e3d8bd-4473c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3d8bd-4473c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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