JavaScript学习与实践（22）

JS Boolean对象，用于转换非布尔型到布尔型，

例子：

<html>
<body>
<script type="text/javascript">
var b1=new Boolean( 0)
var b2=new Boolean(1)
var b3=new Boolean("")
var b4=new Boolean(null)
var b5=new Boolean(NaN)
var b6=new Boolean("false")
document.write("0 is boolean "+ b1 +"<br />")
document.write("1 is boolean "+ b2 +"<br />")
document.write("An empty string is boolean "+ b3 + "<br />")
document.write("null is boolean "+ b4+ "<br />")
document.write("NaN is boolean "+ b5 +"<br />")
document.write("The string 'false' is boolean "+ b6 +"<br />")
</script>
</body>
</html>

大家可以去运行以下

下面是一个比较全面的参考

Boolean Object Methods

FF: Firefox, N: Netscape, IE: Internet Explorer

Method	Description	FF	N	IE
toSource()	Represents the source code of an object	1	4	-
toString()	Converts a Boolean value to a string and returns the result	1	4	4
valueOf()	Returns the primitive value of a Boolean object	1	4	4

Boolean Object Properties

Property	Description	FF	N	IE
constructor	A reference to the function that created the object	1	2	4
prototype	Allows you to add properties and methods to the object	1	2	4

posted @ 2007-01-31 12:15 lxsohu 阅读(472) 评论(1) 收藏举报

刷新页面返回顶部