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zlog-web

v2.0.3

Published

A tiny JavaScript debugging utility, Works in web browsers.

Downloads

246

Readme

A tiny JavaScript debugging utility, Works in web browsers.

用于在浏览器中显示日志,项目从 debug 修改而来,减小仓库文件大小更适用浏览器环境。

改进点

  • 项目用 TypeScript 改写
  • 支持多 JS 文件共用配置定义
  • 提供在页面中显示日志的方法(支持日志过虑及调整日志面板规格)
  • 在浏览器中使用时代码量更少

在页面中显示效果

namespace 规则

用于定义一个日志的的命令空间,用于定义此命令空间的日志在特定规则下是否显示。

特性:

  • 支持同时设置多个 namespace,每个使用空格或逗号分隔。如 name1, name2:*,-name2:test
  • 支持在字符串末尾* 来匹配所有字符。如 app:*能匹配所有 app: 开头的 namespace。
  • 支持在字符串头部- 来排除对应的 namespace。如 -not_this:* 能排除所有 not_tihs 开头的 namespace。

注意:namespace 中不要出现%字符,否则会对设置颜色等操作有影响

namespace 的特性在设置显示哪些日志时使用,比如:

import createDebug from 'zlog-web';

// 设置日志显示规则
createDebug.enable('name:*,-name:input');

// 定义 debug
const input = createDebug('name:input');
const output = createDebug('name:output');
const ctrl = createDebug('name:ctrl');

// 打印日志
input('test input'); // 当前 namespace 规则,此日志不会显示
input('test output');
input('test ctrl');

Formatters

调试使用 printf-style 的格式。以下是官方支持的格式化程序:

| Formatter | 表现 | | --------- | ----------------------------------------------------------- | | %O | 在多行上漂亮地打印对象。 | | %o | 将对象漂亮地打印在一行上。 | | %s | 字符串。 | | %d | 数字(对浮点数会取整) | | %f | 浮点数字 | | %% | 单个百分号('%')。这不消耗参数。 |

修改格式对象:

import createDebug from 'zlog-web';
createDebug.formatters.h = (v) => {
  return v.toString('hex');
}

// …elsewhere
const debug = createDebug('foo');
debug('this is hex: %h', new Buffer('hello world'));
//   foo this is hex: 68656c6c6f20776f726c6421 +0ms

关闭高亮日志

高亮日志的功能默认打开的,关闭日志高亮支持全局关闭,或者只针对某个模块关闭。

全局关闭日志高亮:

import createDebug from 'zlog-web';

createDebug.canUseColor = false;
const zLog = createDebug('test');

zLog('此日志无高亮');

针对模块关闭高亮:

import createDebug from 'zlog-web';

const zLog = createDebug('test');
const zLogNoColor = createDebug('noColor', false);

zLog('此日志会被高亮显示');
zLogNoColor('此日志无高亮');

在网页中显示日志

库中已将log方法对外暴露,覆盖后就能按自己的意愿来显示,项目中提供了一种在网页中显示日志的方法,再结合 URL 参数开关就可在 H5 端显示漂亮的日志了。

import createDebug from 'zlog-web';
import show2Html from 'zlog-web/dist/show2Html';

if(/\bdebugType=html\b/.test(window.location.search)) {
  show2Html(Debug);
}