nodejs

几点问题：

1、怎么直接添加子节点

2、判断目录有效性

3、parseString有没有同步接口

4、readFileSync有没有接口判断读文件是否成功

const fs = require("fs");
const xml2js = require('xml2js');
const path = require("path")
// var xmlParser = new xml2js.Parser({explicitArray:false});
const xmlParser = new xml2js.Parser();

const languageDir = 'D:\\CODE\\testnodejs\\languages';

const outDir = 'D:\\CODE\\testnodejs';

const outxmlName = 'newstring.xml';

var xmlString =
'<?xml version="1.0" encoding="UTF-8"?>'
+'<resources xmlns:tools="http://schemas.android.com/tools" xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">'
+'<string></string>'
+'</resources>'

xmlParser.parseString(xmlString,function(err,allResult) {
    var allstrings = allResult.resources.string;

    var files = fs.readdirSync(languageDir);
    files.forEach(file => {
        var data = fs.readFileSync(path.join(languageDir, file + "\\string.xml"));
        // var data = fs.readFileSync("./languages/values/string.xml");
        xmlParser.parseString(data,function(err,result){
            var strings = result.resources.string;
            strings.forEach(string => {
                string.$.filename = file;
                allstrings.push(string);
            })
        });
    });
    delete allstrings[0];

    const builder = new xml2js.Builder();
    const xml = builder.buildObject(allResult);
    
    fs.writeFile(path.join(outDir, outxmlName), xml, (error) => {
        if (error) {
            throw error;
        }
        console.log("write file OK");
    });
})

console.log("do job success");