代码：
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script src="https://www.jb51.net/article/vue.js"></script> <style> /*当任务完成时，勾选多选框后的样式*/ .finish{ text-decoration:line-through; color:#aaabac; } </style> </head> <body> <div> <!--输入框：v-model用于将输入内容跟content进行数据绑定，keydown.enter用于监听键盘回车事件--> <input type="text" v-model="task.content" placeholder="edit" @keydown.enter="addTask"> <!--任务列表显示区域--> <div> <!--用v-if判断当前是否有任务，任务数组list长度为0时显示暂无任务--> <p v-if="list.length===0">暂无任务</p> <!--用v-for遍历输出任务数组中的任务--> <div v-for="(item,index) in list" > <!--多选框的click事件监听状态（是否勾选）的改变--> <input type="checkbox" @click="changeState(index)" > <!--动态添加样式class='finish'--> <span :class="{'finish':item.finished}">{{ index+1 }}.{{ item.content }}</span> <!--删除按钮：点击按钮执行deleteTak函数，需要注意要传入索引值删除指定任务--> <button @click="deleteTask(index)">delete</button> </div> </div> </div> </body> <script> let vm=new Vue({ el:"#app", data:{ task:{ content:'', finished:false, // deleted:false, }, list:[], addTask(){ this.list.push(this.task); this.task={ content:'', finished:false, // deleted:false, } }, changeState(index){ let nowState=this.list[index].finished; this.list[index].finished=!this.list[index].finished; }, deleteTask(index){ this.list.splice(index,1); } }, }); </script> </html>