你如何在node.js中调用这个函数？ [英] How do you call this function in node.js ?

问题描述

我想弄清楚如何在node.js中调用函数square。问题是square函数本身需要2个参数，一个是宽度，第二个是另一个让我困惑的函数数据，因为我不知道如何调用另一个函数作为参数。

I 'm trying to figure out how to call the function square in node.js. Problem is that the square function itself expects 2 parameters , one the width and second one is another function data which is confusing to me , as i dont know how to call the a function which has another function as paramter.

square(width,function (data)
{
   console.log(data.squareVal);
});


exports.square = function(width,callback)
{
     var aa = new Object();
     callback(aa.squareVal = width * width);    
}


var s = new square(5);

console.log(s);

我尝试了什么：


来自 js-use-of-module-exports-as-a-constructor> javascript - Node.js - 使用module.exports作为构造函数 - Stack Overflow [ ^ ]

推荐答案

你必须这样称呼它

Hi,
you have to call it like this

var s = new square(5, function(result){
  console.log(result);
});

干杯

Alessio

Cheers
Alessio

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