javascript – 如何将参数传递给Node的Q库(denodeify)承诺处理程序

在下面的代码中,我希望变量a,b,c在调用processhttprequest()时作为参数传递.

    var q = require("q");
    var request = require('request');

    function myfun()
    {
        var a, b, c;
        //do some work here
        var httprequest = q.denodeify(request);
        var httprequestpromise = httprequest(httpoptions);
        httprequestpromise.then(processhttprequest);
    }

我试过httprequestpromise.then(processhttprequest.bind([a,b,c]));但没有运气.这是否由Q或任何其他承诺库支持.

解决方法:

您可以像这样使用.bind()：

httprequestpromise.then(processhttprequest.bind(null, a, b, c));

这将创建一个虚函数,在调用processhttprequest()之前将添加参数a,b和c.

或者,您可以使用您自己的存根函数手动执行此操作：

function myfun()
{
    var a, b, c;
    //do some work here
    var httprequest = q.denodeify(request);
    var httprequestpromise = httprequest(httpoptions);
    httprequestpromise.then(function(result) {
        return processhttprequest(a, b, c, result);
    });
}

标签：q,javascript,node-js,promise
来源： https://codeday.me/bug/20190830/1765440.html