2.1.6 Promise
Promise 有三種狀態
pending: 等待中的初始狀態
resolved: 正確完成
rejected: 已拒絕,操作失敗
var isMomHappy = false
var willIGetNewPhone = new Promise(function (resolve, reject) {
if (isMomHappy) {
var phone = {
brand: 'iphone',
color: 'black',
type: 'x'
}
resolve(phone)
} else {
var reason = new Error('Mom is unhappy')
reject(reason)
}
})
var askMom = function () {
willIGetNewPhone
.then(function (fulfilled) {
console.log(fulfilled)
})
.catch(function (error) {
console.log(error.message)
})
}
askMom()
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