<HTML>
<HEAD>
<TITLE>Script 2.3 - A demonstration of variable
scope</TITLE>
<SCRIPT LANGUAGE = "JavaScript" TYPE = "Text/JavaScript">
<!-- Start hiding JavaScript statements
glVarMsg1 = "Global variables created in the HEAD section can be " + "referenced anywhere in this page.";
function CreateVariables()
{
var lcVarMsg1 = "Local variables created inside a function cannot " + "be referenced anywhere else.";
glVarMsg2 = "Global variables created inside functions in the HEAD " + "section can be referenced anywhere in this page.";
}
// End hiding JavaScript statements -->
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE = "JavaScript" Type = "Text/JavaScript">
<!-- Start hiding JavaScript statements
CreateVariables();
glVarMsg3 = "Global variables created in the BODY section can be " + "referenced anywhere in this page.";
document.write(glVarMsg1 + "<BR>");
document.write(glVarMsg2 + "<BR>");
document.write(glVarMsg3 + "<BR>");
document.write(lcVarMsg1 + "<BR>");
// End hiding JavaScript statements -->
</SCRIPT>
</BODY>
</HTML>你在字符串中间加上了回车
所以就会出错了。。
<HEAD>
<TITLE>Script 2.3 - A demonstration of variable
scope</TITLE>
<SCRIPT LANGUAGE = "JavaScript" TYPE = "Text/JavaScript">
<!-- Start hiding JavaScript statements
glVarMsg1 = "Global variables created in the HEAD section can be " + "referenced anywhere in this page.";
function CreateVariables()
{
var lcVarMsg1 = "Local variables created inside a function cannot " + "be referenced anywhere else.";
glVarMsg2 = "Global variables created inside functions in the HEAD " + "section can be referenced anywhere in this page.";
}
// End hiding JavaScript statements -->
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE = "JavaScript" Type = "Text/JavaScript">
<!-- Start hiding JavaScript statements
CreateVariables();
glVarMsg3 = "Global variables created in the BODY section can be " + "referenced anywhere in this page.";
document.write(glVarMsg1 + "<BR>");
document.write(glVarMsg2 + "<BR>");
document.write(glVarMsg3 + "<BR>");
document.write(lcVarMsg1 + "<BR>");
// End hiding JavaScript statements -->
</SCRIPT>
</BODY>
</HTML>你在字符串中间加上了回车
所以就会出错了。。
正确地如下:
<HTML>
<HEAD>
<TITLE>Script 2.3 - A demonstration of variable
scope</TITLE>
<SCRIPT LANGUAGE = "JavaScript" TYPE = "Text/JavaScript">
<!-- Start hiding JavaScript statements
glVarMsg1 = "Global variables created in the HEAD section can be " + "referenced anywhere in this page.";
function CreateVariables()
{
lcVarMsg1 = "Local variables created inside a function cannot " + "be referenced anywhere else.";
glVarMsg2 = "Global variables created inside functions in the HEAD " + "section can be referenced anywhere in this page.";
}
// End hiding JavaScript statements -->
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE = "JavaScript" Type = "Text/JavaScript">
<!-- Start hiding JavaScript statements
CreateVariables();
glVarMsg3 = "Global variables created in the BODY section can be " + "referenced anywhere in this page.";
document.write(glVarMsg1 + "<BR>");
document.write(glVarMsg2 + "<BR>");
document.write(glVarMsg3 + "<BR>");
document.write(lcVarMsg1 + "<BR>");
// End hiding JavaScript statements -->
</SCRIPT>
</BODY>
</HTML>
1、var 变量名 = "XXXXXXXXX" + "YYYYYYY"时"XXXXXXXXX"之间不能有回车,但+也是表示联接符可以有回车换行;
因此:
var 变量名 = "XXXXXXXXX"
+ "YYYYYYY"
或者
var 变量名 = "XXXXXXXXX"
+
"YYYYYYY"
这样的写法都是正确的;
但:
var 变量名 = "XXXXXXX
XX" + "YYYYYYY"
是错误的;并且你的CreateVariables()函数没有返回值,但又要在函数外面调用里面的变量,肯定会报错;若想让函数内的两个变量内容能显示出来可以这样写:
<HTML>
<HEAD>
<TITLE>Script 2.3 - A demonstration of variable
scope</TITLE>
<SCRIPT LANGUAGE = "JavaScript" TYPE = "Text/JavaScript">
<!-- Start hiding JavaScript statements
glVarMsg1 = "Global variables created in the HEAD section can be "
+
"referenced anywhere in this page.";
function CreateVariables()
{
var lcVarMsg1 = new Array();
lcVarMsg1[0] = "Local variables created inside a function cannot "
+ "be referenced anywhere else.";
lcVarMsg1[1] = "Global variables created inside functions in the HEAD "
+ "section can be referenced anywhere in this page.";
return lcVarMsg1;
}
// End hiding JavaScript statements -->
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE = "JavaScript" Type = "Text/JavaScript">
<!-- Start hiding JavaScript statements
var lcVarMsg1 = CreateVariables();
glVarMsg3 = "Global variables created in the BODY section can be " +
"referenced anywhere in this page.";
document.write(glVarMsg1 + "<BR>");
document.write(lcVarMsg1[0] + "<BR>");
document.write(glVarMsg3 + "<BR>");
document.write(lcVarMsg1[1] + "<BR>");
// End hiding JavaScript statements -->
</SCRIPT>
</BODY>
</HTML>