Eclipse中出现JS文件前有红叉的解决方法，亲测有效：
- Right click your project (右单击工程属性)
- Select Properties -> JavaScript -> Include(选择JavaScript下的include菜单)
- Select Source tab (It looks similar to the Java Build Path Source tab)(选择SOURCE标签)
- Expand source folder(展开菜单)
- Highlight Excluded pattern(选择Excluded)
- Click Edit button(点击edit按钮)
- Click Add button next to Exclusion patterns box.在新对话框中点击add按钮
- Click Browse button and select the JavaScript source by name.(找到需要排除的javascript文件)
转载自：http://blog.csdn.net/hao00zzb/article/details/8496448
Eclipse中出现JS文件前有红叉的解决方法
原文地址：https://www.cnblogs.com/zhangda001/p/8537275.html