/*
JavaScript Bible, Fourth Edition
by Danny Goodman
John Wiley & Sons CopyRight 2001
*/
Variable Scope Trials
var headGlobal = "Gumby"
function doNothing() {
var headLocal = "Pokey"
return headLocal
}
// 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 + "
"
// page += "headLocal is: " + headLocal + "
" // : headLocal not defined
page += "headLocal value returned from head function is: " + doNothing() + ""
page += " aBoy is: " + aBoy + "
" // picks up global
page += "local version of hisDog is: " + hisDog + "
" // "sees" only local
document.write(page)
}
testValues()
document.write("global version of hisDog is intact: " + hisDog)