The Boolean type has two literal
values: true and false.

Do not confuse the primitive Boolean
values true and false with the true
and false values of the Boolean
object. The Boolean object is a
wrapper around the primitive Boolean
data type. See Boolean Object for more
information.

这是什么意思？布尔对象和布尔数据类型有什么区别？

解决方法:

这是一个布尔值：

true

这是一个包装值的布尔对象：

new Boolean(true);

具有对象会增加一个间接级别.尝试看一下区别：

var a = true;
var b = true;
var c = new Boolean(true);
var d = new Boolean(true);

alert(a == b); // true - two `true` values are equal.
alert(c == d); // false - they are not the same object.

也可以看看：

> What is the purpose of new Boolean() in Javascript?