javascript - Nodejs - 使用属性读取器包时出错

Question

我正在尝试使用 nodejs 的 properties-reader 包编写通用属性读取器实用程序。以下是实现:

var propertiesReader = require('properties-reader')
var path = require('path')

var property = getPropertyFile('./fileName.properties');
console.log(getProperty(property,'user1.username'))

function getPropertyFile(err, filePath){
    if(err){
        console.log("Error occured while reading properties file: "err);
    }
    else{
        return propertiesReader(filePath);
    }
}

function getProperty(err, propertyFile, propertyName){
    if(err){
        console.log("Error occured while getting properties: ",err);
    }
    else{
        return propertyFile.get(propertyName)
    }   
}

在执行上述代码时，我在读取文件和获取属性值时遇到错误，如下所示:

E:\NodeJS\>node propertiesUtility.js
Error occured while reading properties file:  ./locatorValues.properties
E:\NodeJS\propertiesUtility.js:24
                return propertyFile.get(propertyName)
                                    ^

TypeError: propertyFile.get is not a function
    at getProperty (E:\NodeJS\propertiesUtility.js:24:23)
    at Object.<anonymous> (E:\NodeJS\propertiesUtility.js:5:13)
    at Module._compile (module.js:435:26)
    at Object.Module._extensions..js (module.js:442:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:313:12)
    at Function.Module.runMain (module.js:467:10)
    at startup (node.js:136:18)
    at node.js:963:3

有人可以帮我纠正我的代码吗？

Answer 1

您正在将一个'user1.username'传递给getProperty(err, propertyFile, propertyName)，它是一个纯字符串，现在propertyFile是一个纯字符串

'user1.username'.get(propertyName);

除非您已将方法 get() 添加到字符串原型(prototype)，否则该方法不存在。