If you do not want to use js in the development, or want to alert you can log re...

代码说明：

如果您不想在开发js时用alert或者想把log记录下来您可以在页面上引入文件后写var log =new Log() log.info() log.error() log.warn() 来输出您关心的东西，您将会在您的页面上看到一个窗口，里面记录了你输出的东西-If you do not want to use js in the development, or want to alert you can log recorded on the page after the introduction of paper to write var log = new Log () log.info () log.error () log.warn () to the output you care about things, you will see on your page a window, which records the output of your things