const fs = require('fs');
var path = '/home/xuranus//';
var file_list = [
    'A.json',
    'B.json',
    'C.json',
    'D.json',
];

var arr = [];
file_list.forEach(file=>{
    fs.readFile(path+file,(err,data)=>{
        if(err) console.log(file,err);
        else {
            console.log('reading ',file)
            var stu = data.toString(); //data从bin->string
            stu = JSON.parse(stu);//string -> json
            rows = stu.rows;
            rows.forEach(element => {
                if(element.pwd!=undefined)
                    arr.push(element.pwd);//pass
                if(element.phome!=undefined)
                    arr.push(element.phone);//phone
                if(element.email!=undefined)
                    arr.push(element.email.split('@')[0]);//qq
                if(element.code!=undefined)
                    arr.push(element.code);//id\
            });
        }
    });
});

console.log(arr.length)