Promise 極簡版之不專業學習筆記

 1let isPerformanceOK = false;
 2
 3// 底下這包不會馬上執行, 而是得 "經由其他事情再來觸發執行"
 4let willRaiseSalary = new Promise(function(resolve, reject) {
 5    if (isPerformanceOK) {
 6        let additionalPayments = {
 7            newPay: 10000,
 8            currency: 'NTD'
 9        }
10        resolve(additionalPayments);
11    } else {
12        let reason = new Error("Don't cry, you can do better");
13        reject(reason);
14    }
15});

 1var askYourBoss = function() {
 2    // 這時候再來看看履約的結果
 3    willRaiseSalary.then(function(fulfilled) {  // fulfilled 為 成功的結果
 4        console.log(fulfilled);
 5    }).catch(function(err) {  // err 為 失敗的結果
 6        console.log(err.message);
 7    });
 8}
 9
10// 月底了, 去問候你老闆吧
11askYourBoss();

1
2var eatBigMealWithRightHand = function(additionalPayments) {
3    return new Promise(function(resolve, reject) {
4        let restaurant = 'Lu-Biean-Tan';
5        resolve(restaurant);
6    });
7}

 1var askYourBoss = function() {
 2    willRaiseSalary
 3        .then(eatBigMealWithGF)
 4        .then(function(fulfilled) {
 5            console.log("吃完大餐後要做的事情2...");
 6        })
 7        .then(function(fulfilled) {
 8            console.log("吃完大餐後要做的事情3...");
 9        })
10        .catch(function(error) {
11            console.log(error.message);
12        });
13}