<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script src="https://unpkg.com/[email protected]/dist/vue.js"></script> <div id="app"> <input type="text" v-model="available_time" v-format-floor> <input type="text" v-model="a" v-format-floor> <button @click="show">button</button> </div> <script> var vm = new Vue({ el:"#app", data:{ available_time:"", a: '', }, methods:{ show(){ console.log(this.a) } }, directives: { "format-floor": { update: function (e,vnode,oldVnode) { // 获取变量名字 var temp = oldVnode.data.directives[0].expression;var e = e.value; e = Math.floor(e) || 0; vm[temp] = e; } } } }) </script> </body> </html>