const fs = require("fs");

let log_types = {
    "ERROR":"<b style='color: red;'>ERROR</b>",
    "INFO":"<b style='color: blue;'>INFO</b>",
    "SEARCH":"<b style='color: green;'>SEARCH</b>",
    "OPEN":"<b style='color: DarkGreen;'>OPEN</b>",
    "TALK":"<b style='color: orange;'>TALK</b>"
};

function log(message, user, type){
    fs.appendFile(
        "1.html",
        "&nbsp;&nbsp;&nbsp;" + type + " (" + user + ") - " +  message + "<br>",
        function (err) {
            if (err) throw err;
            console.log('Saved!');
        }
    );
}

log("написал \"Привет\"", "123", log_types['TALK']); //Лог
log("написал \"Привет\"", "123", log_types['ERROR']); //Лог
log("написал \"Привет\"", "123", log_types['OPEN']); //Лог
log("написал \"Привет\"", "123", log_types['INFO']); //Лог