Eclipse Porject Facets 下没有 Dynamic Web Module 问题

打开项目目录.setting里的org.eclipst.wst.commom.project.facets.core.xml文件,
<faceted-project>标签下添加 <installed facet="jst.web" version="3.0"/>

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
  <installed facet="jst.web" version="3.0"/>    <!-- Dynamic Web Module 3.0 -->
  <runtime name="Apache Tomcat v8.0"/>  
  <secondary-runtime name="jdk1.8.0_162"/>      
  <installed facet="java" version="1.8"/>       <!-- JDK 1.8 -->
  <installed facet="wst.jsdt.web" version="1.0"/>   <!-- JavaScript 1.0 -->
</faceted-project>