angular中的$log与console.log()到底有什么区别？

Question

为什么eslint的规范中有一个选项，提倡都使用$log来取代console.log.
不知道二者之间有什么区别

Answer 1

我猜的哈，angular项目中console.log输出的是angular处理过的一些对象，比如加入一些属性啊之类的，$log输出的格式要好一些。

Answer 2

1. $log会检查浏览器是否支持console.log，这样避免浏览器不支持console.log而报异常。

2. 可以开关控制log $logProvider.debugEnabled(false)

3. 可以格式化错误信息，参考源码

Answer 3

stackoverflow的回答，
https://stackoverflow.com/que...

$log first checks if the browser supports console.log (IE 8, for example, doesn't). This prevents errors being displayed on IE 8. Note: this doesn't mean it will log anything on IE 8, it simply means it won't throw the error.

Next to that, it also allows you to decorate and mock $log for extending and testing purposes, if you are so inclined. You could for example decorate it to log to an array for IE 8 support.

A bonus feature: if you pass it a JavaScript Error instance, it will attempt to format it nicely. This can be found out by reading the source code.

EDIT: "It is not that IE 8 doesn't support console.log. It just doesn't create the console object until the dev tools are opened." See comments below for more details.