Description: Ajax login validation, the principle code examples, you can clearly see how to submit a request by js asynchronous.
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AjaxDemo1
.........\.classpath
.........\.myeclipse
.........\.mymetadata
.........\.project
.........\.settings
.........\.........\org.eclipse.core.resources.prefs
.........\.........\org.eclipse.jdt.core.prefs
.........\src
.........\WebRoot
.........\.......\check
.........\.......\.....\check.html
.........\.......\.....\checkUser.jsp
.........\.......\WEB-INF
.........\.......\.......\classes
.........\.......\.......\lib
.........\.......\.......\web.xml
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