Bugs caused by JS comments will be executed even if the comments are _javascript tricks

I encountered a strange BUG while writing JS today. It keeps prompting me that one of the attributes in the JAVA class does not exist. I removed that attribute. But I also blocked that attribute in JS!

Copy code The code is as follows:

// var pro = "${product.proGrade} ";

This is proGrade. How strange. I found out later. Even comments in JS will be executed. Just not shown to you.