What does _ .shuffle mean in vue animation

1. Is shuffle built-in when reordering lists in vue animations?

 shuffle: function () {
      this.items = _.shuffle(this.items)
    }

1. What does _. mean

Feb.27,2021
This method is available for and underscore plugins for

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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-64f5-1b2c5f3-4e776.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2c5f3-4e776.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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