1.1 创建promise对象和存储数据

<script>
    //创建promise对象
    var promiseObj = new Promise(function (resolve, reject) {
        //调用resolve把成功的数据存储到promise对象里
        resolve('成功了')
    });
    console.log(promiseObj);
    console.log('---------------------------');
    var promiseObj2 = new Promise(function (resolve, reject) {
        reject('失败了')
    })
    console.log(promiseObj2);
    console.log("-------------------------");
    var flag = false;
    var promiseObj3 = new Promise(function (resolve, reject) {
        if (flag) {
            resolve('成功了')
        }else{
            reject('失败了')
        }
    })
    console.log(promiseObj3);
</script>