Quick Dirty D.I.Y. android console for debugging

diyandroiddebugconsole.js

        if ((/android/gi).test(navigator.appVersion)) {
            console = {
                "_log": [],
                "log": function (...params) {
                    let arr = params.map(x => JSON.stringify(x))
                    this._log.push("LOG:" + arr.join(" "));
                },
                "warn": function (...params) {
                    let arr = params.map(x => JSON.stringify(x))
                    this._log.push("WARN:" + arr.join(" "));
                },
                "error": function (...params) {
                    let arr = params.map(x => JSON.stringify(x))
                    this._log.push("ERR:" + arr.join(" "));
                },
                "show": function (uuu) {
                    let message = uuu
                    if (!message) {
                        message = this._log.join("\n")
                    }
                    let xxx = prompt(message, "localStorage");
                    this._log = [];
                    if (xxx) {
                        return this.show(JSON.stringify(eval(xxx), null, 1));
                    }
                }
            };

            window.onerror = function (msg, url, line) {
                console.log("ERROR: \"" + msg + "\" at \"" + "\", line " + line);
            }

            window.addEventListener("touchstart", function (e) {
                if (e.touches.length >= 3 && console._log.length) {
                    console.show();
                }
            });

        }

based on https://eclipsesource.com/blogs/2012/08/14/debugging-javascript-on-android-and-ios/

press with 3 or more fingers to view console output in alert popup, enter code in prompt to be evaluated