# Background: Since the project needs ali Cloud OSS storage and javascript SDK, three JS are introduced in the index. HTML page, as shown in the figure:There is no runtime error when running the project, but the console does:When you click into each JS, h5’s declaration label is actually wrong, as shown in the picture:After various Google and Baidu searches, I found that the type attribute plays a role of symbol in module mode (I don’t understand it here).Type =”text/javascript”. I would like to use this article to spur themselves!