function Promise1(executor) {
var _this = this;
this.status = "pending";//状态
this.value = undefined;//成功 结果
this.reason = undefined;//用来 保存失败原因
this.onFulfilledFunc = [];//用来暂存成功回调
this.onRejectedFunc = [];//用来暂存 失败回调
executor(resolve, reject);
function resolve(value) {
if (_this.status === "pending") {
_this.value = value;
_this.onFulfilledFunc.forEach(function (fn) {
fn(value)
});
_this.status = "resolved";
}
}
function reject(reason) {
if (_this.status === "pending") {
_this.reason = reason;
_this.onRejectedFunc.forEach(function (fn) {
fn(reason);
})
_this.status = "rejected"
}
}
}
Promise1.prototype.then = function (onFulfilled, onRejected) {
if (this.status === "resolved") {
if (typeof onFulfilled === "function") {
onFulfilled(this.value)
}
} else if (this.status === "rejected") {
if (typeof onRejected === "function") {
onRejected(this.reason)
}
} else if (this.status === 'pending') {
if (typeof onFulfilled === "function") {
this.onFulfilledFunc.push(onFulfilled)
}
if (typeof onRejected === "function") {
this.onRejectedFunc.push(onRejected);
}
}
}
var a = new Promise1(function (resolve, reject) {
setTimeout(function () {
console.log(123);
resolve("are you ok")
}, 10000)
})
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