app.js

const app = new Vue({
    el: '#app',
    data: {
        titulo : 'Clientes del GYM',
        tareas: [],
        nuevaTarea:""
    },
    methods: {
        agregarTarea : function(){
            this.tareas.push({
                nombre:this.nuevaTarea,
                estado: false
            });
            this.nuevaTarea='';
            localStorage.setItem('gym-vue', JSON.stringify(this.tareas));
        },
            editarTarea : function(index){
                this.tareas[index].estado=true;
                localStorage.setItem('gym-vue', JSON.stringify(this.tareas));
            },
            eliminar : function(index){
                this.tareas.splice(index,1)
                localStorage.setItem('gym-vue', JSON.stringify(this.tareas));
            }
        
    },
    created : function(){
         let datosDB =JSON.parse(localStorage.getItem('gym-vue'));
         if(datosDB === null){
             this.tareas=[];
         }else{
             this.tareas = datosDB;
         }
    }
})