<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <script type="text/javascript" src="../js/vue.js"></script> <title>Document</title> </head> <body> <div id="root"> 姓 <input type="text" v-model="firstNam" ><br> 名 <input type="text" v-model="lastName"><br> 全名 <span>{{fullName}}</span> </div> <script> const vm=new Vue({ el: "#root", data: { firstNam: "张", lastName:"三" }, computed:{ fullName:{ //当有人读取fullName时，get就会被调用，且返回值就作为fullName的值 //初次读取fullName会被调用get ，所依赖的数据发生变化的时候get也重新调用 get(){ return this.firstNam+"-"+this.lastName; }, //set当fullName被修改时 set(value){ const arr=value.split("-"); this.firstNam=arr[0]; this.lastName=arr[1]; } } } }) </script> </body> </html>
插值法实现
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <script type="text/javascript" src="../js/vue.js"></script> <title>Document</title> </head> <body> <div id="root"> 姓 <input type="text" v-model="firstNam" ><br> 名 <input type="text" v-model="lastName"><br> 全名 <span>{{firstNam}}-{{lastName}} </span> </div> <script> new Vue({ el: "#root", data: { firstNam: "张", lastName:"三" } }) </script> </body> </html>
methods实现
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <script type="text/javascript" src="../js/vue.js"></script> <title>Document</title> </head> <body> <div id="root"> 姓 <input type="text" v-model="firstNam" ><br> 名 <input type="text" v-model="lastName"><br> 全名 <span>{{fullName()}} </span> </div> <script> new Vue({ el: "#root", data: { firstNam: "张", lastName:"三" }, methods:{ fullName(){ return this.firstNam+"-"+this.lastName; } } }) </script> </body> </html>