Article From:https://segmentfault.com/q/1010000009603176
Question:

Looking at the uncompressed version of flv. js, you can’t find a place to call Log. How do you monitor and output the log in real time?

var Log = function () {
    function Log() {
        _classCallCheck(this, Log);
    }

    _createClass(Log, null, [{
        key: 'e',
        value: function e(tag, msg) {
            if (!Log.ENABLE_ERROR) {
                return;
            }

            if (!tag || Log.FORCE_GLOBAL_TAG) tag = Log.GLOBAL_TAG;

            var str = '[' + tag + '] > ' + msg;

            if (console.error) {
                console.error(str);
            } else if (console.warn) {
                console.warn(str);
            } else {
                console.log(str);
            }
        }
    }, {
        key: 'i',
        value: function i(tag, msg) {
            if (!Log.ENABLE_INFO) {
                return;
            }

            if (!tag || Log.FORCE_GLOBAL_TAG) tag = Log.GLOBAL_TAG;

            var str = '[' + tag + '] > ' + msg;

            if (console.info) {
                console.info(str);
            } else {
                console.log(str);
            }
        }
    }, {
        key: 'w',
        value: function w(tag, msg) {
            if (!Log.ENABLE_WARN) {
                return;
            }

            if (!tag || Log.FORCE_GLOBAL_TAG) tag = Log.GLOBAL_TAG;

            var str = '[' + tag + '] > ' + msg;

            if (console.warn) {
                console.warn(str);
            } else {
                console.log(str);
            }
        }
    }, {
        key: 'd',
        value: function d(tag, msg) {
            if (!Log.ENABLE_DEBUG) {
                return;
            }

            if (!tag || Log.FORCE_GLOBAL_TAG) tag = Log.GLOBAL_TAG;

            var str = '[' + tag + '] > ' + msg;

            if (console.debug) {
                console.debug(str);
            } else {
                console.log(str);
            }
        }
    }, {
        key: 'v',
        value: function v(tag, msg) {
            if (!Log.ENABLE_VERBOSE) {
                return;
            }

            if (!tag || Log.FORCE_GLOBAL_TAG) tag = Log.GLOBAL_TAG;

            console.log('[' + tag + '] > ' + msg);
        }
    }]);

    return Log;
}();

Log.GLOBAL_TAG = 'flv.js';
Log.FORCE_GLOBAL_TAG = false;
Log.ENABLE_ERROR = true;
Log.ENABLE_INFO = true;
Log.ENABLE_WARN = true;
Log.ENABLE_DEBUG = true;
Log.ENABLE_VERBOSE = true;

exports.default = Log;

Answer 0:

An exclamation mark, a yellow background, is console.warn.

console.warn

https://github.com/Bilibili/f…

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