JavaScript中的Boolean对象和Boolean数据类型有什么区别？

Question

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.

What does this mean? What's the difference between the Boolean object and the Boolean data type??

Answer 1

This is a boolean value:

true

This is a Boolean object wrapping the value:

new Boolean(true);

Having the object adds a level of indirection. Try this to see the difference:

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.

See also:

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

Answer 2

我想添加其他答案，布尔对象也可以为null ，但布尔值不能。

Answer 3

The boolean data type is a value that can only be true or false. The Boolean object is an object that represents a boolean value.

Answer 4

The Boolean Data Type is the 'boolean' (TRUE or FALSE) whereas the Boolean Object is an object that translates values INTO boolean data

You'll find an explanation here

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