The TodoList problem of vue implementation

the code is as follows:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
</head>
<style>
    ul li {
        list-style: none;
    }
    .done {
        text-decoration: line-through;
        color: indianred;
    }
</style>
<body>
<div id="app">
    <div>
        

3 of {{todo.length}} remaning[arctive]

<ul> <li v-for="(item,index) of todo" :key="item.index"> <input type="checkbox" v-model="item.done"> <span :class="{done:item.done}">{{item.id}}---{{item.content}}</span> <button @click="deleteClick(index)">X</button> </li> </ul> </div> <input type="text" v-model="todoText" @keydown.enter="addToClick"> <button @click="addToClick"></button> </div> <script> const app = new Vue({ el: "-sharpapp", data: { todoText: "", todo: [ {id: 1, content: "FOO", done: true}, ], }, methods: { addToClick: function () { if (this.todoText === "") {// return } this.todo.push({ id: this.todo[this.todo.length - 1].id + 1, content: this.todoText.trim(), done: false }); this.todoText = ""; }, deleteClick: function (index) { console.log(index); this.todo.splice(index, 1); } } }) </script> </body> </html>

there is a requirement:

clipboard.png
when I click on the 8th, delete it, and the following 9Magol 10. 11 becomes 8jin9. 10. and so on. Do you need to re-render the deleteClick during the click event?
which experienced friend should I ask? Thank you

Mar.12,2021

{{item.id}}-{{item.content}}

this place is changed to

{{index+1}}-{{item.content}}


vmurf = "{value,key,index} in object"

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-64f5-1b37fe6-2c0e2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37fe6-2c0e2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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