Variable Scope Workbench Page : Function « Language Basics « JavaScript DHTML






  1. JavaScript DHTML
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Variable Scope Workbench Page

/* JavaScript Bible, Fourth Edition by Danny Goodman John Wiley & Sons CopyRight 2001 */ <HTML> <HEAD> <TITLE>Variable Scope Trials</TITLE> <SCRIPT LANGUAGE="JavaScript"> var headGlobal = "Gumby" function doNothing() { var headLocal = "Pokey"return headLocal } </SCRIPT> </HEAD> <BODY> <SCRIPT LANGUAGE="JavaScript"> // two global variables var aBoy = "Charlie Brown" var hisDog = "Snoopy" function testValues() { var hisDog = "Gromit"// initializes local version of "hisDog"  var page = "" page += "headGlobal is: " + headGlobal + "<BR>"// page += "headLocal is: " + headLocal + "<BR>" // : headLocal not defined  page += "headLocal value returned from head function is: " + doNothing() + "<P>" page += " aBoy is: " + aBoy + "<BR>"// picks up global  page += "local version of hisDog is: " + hisDog + "<P>"// "sees" only local  document.write(page) } testValues() document.write("global version of hisDog is intact: " + hisDog) </SCRIPT> </BODY> </HTML>








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