fs.readFileSync无法读取nodejs中的文件传递路径变量 [英] fs.readFileSync Cannot read file passing path variable in nodejs

问题描述

我正在尝试使用fs读取xml文件.在将路径变量作为该函数的第一个参数传递后，我无法使用fs.readFileSync读取文件.注意:这是在Windows机器中

I am trying to read xml file using fs.I am not able to read file using fs.readFileSync after passing path variable as first paramter to this function. Note:this is in windows machine

xmlFile="C:\Users\xyz\AppData\Local\.proxySettings.xml";
function myFunc(xmlFile) {
 let xmlData = fs.readFile(xmlFile);
 alert(xmlData);//doesn't print anything

 parser = new DOMParser();
 xmlDoc = parser.parseFromString(xmlData,"text/xml");
....
....
}

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  <proxy_port>2582</proxy_port>

更新文件

 try{
    ffile="jdkdkj";
  fs.readFileSync(ffile); 
}catch(err){
  app.console.log(err);
}

Error { errno: -4058, syscall: 'open', code: 'ENOENT', path: 'jdkdkj' }

推荐答案

在JavaScript中，反斜杠字符用于表示紧随其后的字符应作特殊处理.为了在JavaScript字符串中创建文字反斜杠，您需要使用另一个反斜杠对反斜杠进行转义.

In JavaScript the backslash character is used to signal that the character immediately following it should be treated specially. In order to create a literal backslash inside a JavaScript string you need to escape the backslash with another backslash.

var a = "\abc";
console.log(a); // abc
var b = "\\abc";
console.log(b); // \abc
var c = "\"abc\"";
console.log(c); // "abc"

xmlFile="C:\\Users\\xyz\\AppData\\Local\\.proxySettings.xml";
console.log(xmlFile); // C:\Users\xyz\AppData\Local\.proxySettings.xml

因此，Windows路径名在JavaScript中始终需要双反斜杠

So, windows pathnames always need double backslashes in JavaScript

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