JavaScript Boolean object

JavaScript Boolean (Boolean) Object

TBoolean (Boolean) object is used to convert non-Boolean values to Boolean values (true or false).

Create a Boolean object

The Boolean object represents two values: "true" or "false"

The following code defines a Boolean object named myBoolean:

var myBoolean=new Boolean();

If the Boolean object has no initial value or its value is:

0-0null""falseundefinedNaN

Then the object's The value is false. Otherwise, its value is true (even when the argument is the string "false")!

Continuing Learning

new file

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>php中文网(php.cn)</title> </head> <body> <script> 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 为布尔值 "+ b1 +"<br>"); document.write("1 为布尔值 "+ b2 +"<br>"); document.write("空字符串是布尔值 "+ b3 + "<br>"); document.write("null 是布尔值 "+ b4+ "<br>"); document.write("NaN 是布尔值 "+ b5 +"<br>"); document.write("字符串'false' 是布尔值"+ b6 +"<br>"); </script> </body> </html>

submit Reset Code

Automatic operation