Do not render the page after the vue array is updated?

if you don"t want the data in the diagram, you can delete it successfully, add it or enter it, but you can"t render it. May I ask what"s going on? using this.$set (this.value [0], 2, {a 3}) doesn"t work

.
this.value = [[{a:1},{a:2},{a:3}],[]]
delete () {
   //
    this.value[0].splice(2,1)
}
// 
add () {
     this.value[0].splice(2,1, {a:3})
}

clipboard.png

Jun.22,2021

read this article carefully

https://codeshelper.com/a/11.

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