.settings各文件的作用

org.eclipse.jdt.core.prefs

is
really important and control how you compile your java project.

org.eclipse.jst.common.project.facet.core.prefs

adds
a Facet, basically a way to
introduce functionality to projects in Eclipse, therefore a project can have one or more facets (ie. it could be a Java project and a EJB project). See here
for illustration (search the word 'Facet')

org.eclipse.jst.j2ee.ejb.annotations.xdoclet.prefs

is
a way to Configuring XDoclet annotation
support

org.eclipse.wst.common.component

is
relate to the deployment structure.

org.eclipse.wst.common.project.facet.core.xml

is
used to Specifying target servers
for J2EE projects

org.eclipse.wst.validation.prefs

refers
to Wst validation

org.eclipse.wst.jsdt.ui.superType.container/name

as
explained here, is a configuration for JSDT part:

By default, plain javascript files (.js) inherit members from object Global. HTML files contained in a static/dynamic web project inherit members from object Window.

So if your context is a plain javaScript file it will appear that only Window.window or Window.alert(..) is valid since none of the Window members are inherited. What you really want is to inherit this field + method from an instance of the Window object.

,

The JSDT supports a configurable super type at the project level. Each .js or .html file within a project inherits all the fields and methods from the projects super type. By default the type is Global for standalone JavaScript projects and Window for Static/Dynamic
Web Projects.

,

You can change the super type for a project from the JavaScript Include Path properties page from Object Global to Object Window to achieve the results you desire... On the Global Order/SuperType page change the Super Type to Window in the ECMA library.