JScript 注释
更新：2007 年 11 月
单行 JScript 注释以两个正斜杠 (//) 开始。
代码中的注释
以下是单行注释（后跟一行代码）的一个示例。
// This is a single-line comment.
aGoodIdea = "Comment your code for clarity.";
多行 JScript 注释以正斜杠和星号 (/*) 开头，以相反的顺序 (*/) 结束。
/*
This is a multiline comment that explains the preceding code statement.
The statement assigns a value to the aGoodIdea variable. The value,
which is contained between the quote marks, is called a literal. A
literal explicitly and directly contains information; it does not
refer to the information indirectly. The quote marks are not part
of the literal.
*/
如果试图在一个多行注释中嵌入另一个多行注释，JScript 将以一种意想不到的方式解释生成的多行注释。标记嵌入的多行注释结尾的 */ 将被解释为整个多行注释的结尾。因此，在嵌入的多行注释后面的文本将被解释为 JScript 代码，并可能生成语法错误。
在下面的示例中，由于 JScript 将最里面的 */ 解释为最外面注释的结尾，因此第三行文本将被解释为 JScript 代码：
/* This is the outer-most comment
/* And this is the inner-most comment */
...Unfortunately, JScript will try to treat all of this as code. */
建议将所有注释编写为单行注释的块。这样就允许随后用一个多行注释来注释大段代码。
// This is another multiline comment, written as a series of single-line comments.
// After the statement is executed, you can refer to the content of the aGoodIdea
// variable by using its name, as in the next statement, in which a string literal is
// appended to the aGoodIdea variable by concatenation to create a new variable.
var extendedIdea = aGoodIdea + " You never know when you'll have to figure out what it does.";
或者还可以使用条件编译安全有效地注释大段代码。