13.promise的简单应用

有这么一个需求，有两个数组，我们要将第一个数组的name属性的值，换成第二个数组的对应的项的值，将name换成fullName

      var persons = [
            {name: 'jason', age: 18, hobbit:'sleep', id: 1},
            {name: 'jams', age: 20, hobbit: 'eat', id: 2}
        ];
        var owner = [
            {firstName: 'zhang', lastName: 'jason'},
            {firstName: 'li', lastName: 'jams1'}
        ];


        function findPerson(id) {
            return new Promise((resolve, reject) => {
                setTimeout(() => {
                    var person = persons.find(person => person.id == id);
                    if (person) {
                        resolve(person);
                    } else {
                        reject(Error('not find the person'))
                    }
                }, 3000);
            })
        }

        function fullName(res) {
            return new Promise((resolve, reject) => {
                setTimeout(() => {
                   var name = owner.find(name => name.lastName == res.name);
                   res.name = name;
                   if(name) {
                       resolve(res)
                   }else {
                       reject(Error('name is not found'))
                   } 
                }, 3000);
            })
        }

        findPerson(2).then(data => fullName(data)).then(data => console.log(data))