Mini Program wepy framework assigns values to data data. What's the difference between this.$apply () and this.setData ({})?

for example: data = {

name: ""

}
methods = {

changeName(){
//this.$apply()
this.name = ""

}

changeName(){
    //this.setData()
    this.setData({
    name: ""
    })
}

}


wepy framework does not need this.setData ()

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-64f5-1b32890-2be15.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32890-2be15.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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