javascript - 如何传递 Promise 执行器数据？

Question

有没有办法在不依赖闭包的情况下将 params 带入 Promise 的主体？我宁愿不必使用 var self = this;

function Service(n) {
    this.n = n;
}
Service.prototype = {
    get: function (params) {
        var self = this;
        return new Promise(function(resolve, reject){
            if (params[self.n]) {
                resolve("Service " + self.n);
            } else {
                reject("Service " + self.n);
            }
        });
    }
}

Answer 1

您实际上可以改为创建立即解决/拒绝的 promise :

Service.prototype = {
    get: function (params) {
        if (params[this.n]) {
            return Promise.resolve("Service " + this.n);
        }

        return Promise.reject("Service " + this.n);
    }
}

引用资料:

• > MDN - Promise.resolve()
• > MDN - Promise.reject()