【发布时间】：2018-01-09 17:03:45
【问题描述】：
我正在为一个具有多个功能的类而苦苦挣扎。他们每个人都返回一个承诺。
我的问题是，在第一次返回 Promise 之后，next 函数中的 this-reference 不是类对象而是全局节点对象。
这里是一些示例代码：
index.js：
"use strict";
const debug = require("./dbg.js");
const testClass = require("./testClass.js");
const dbg = new debug();
const tc = new testClass(dbg);
tc.printTestMessage()
.then(tc.Test1)
.then(tc.Test2)
.then(tc.Test3);
testClass.js：
"use strict";
const Promise = require("bluebird");
let testClass = function(dbg) {
let self = this;
self._dbg = dbg;
};
testClass.prototype.printTestMessage = function() {
let self = this;
return new Promise(function(resolve) {
self._dbg.printDebug(3, "testClass - printTestMessage", "start printing...");
setTimeout(function() {
self._dbg.printDebug(3, "testClass - printTestMessage", "finished printing...");
resolve();
}, 2000);
});
};
testClass.prototype.Test1 = function() {
let self = this;
return new Promise(function(resolve) {
self._dbg.printDebug(3, "testClass - Test1", "start printing...");
setTimeout(function() {
self._dbg.printDebug(3, "testClass - Test1", "finished printing...");
resolve();
}, 2000);
});
};
testClass.prototype.Test2 = function() {
let self = this;
return new Promise(function(resolve) {
self._dbg.printDebug(3, "testClass - Test2", "start printing...");
setTimeout(function() {
self._dbg.printDebug(3, "testClass - Test2", "finished printing...");
resolve();
}, 2000);
});
};
testClass.prototype.Test3 = function() {
let self = this;
return new Promise(function(resolve) {
self._dbg.printDebug(3, "testClass - Test3", "start printing...");
setTimeout(function() {
self._dbg.printDebug(3, "testClass - Test3", "finished printing...");
resolve();
}, 2000);
});
};
module.exports = testClass;
关于如何将每个函数粘贴到类引用中的任何帮助？
【问题讨论】：
标签： javascript node.js promise bluebird