闭包内定义局部变量

function test(){

	test1()
	alert(aaaa)

}
function test1(){
	window.aaaa = "测试一"
}

test()   //输出"测试一"

function test(){

	test1()
	alert(aaaa)

}
function test1(){
	var aaaa = "测试二"
}

test()   //报错"aaaa is not defined"