JavaScript Tutorial/Number Data Type/Boolean
Содержание
Boolean
The Boolean object is a wrapper object that holds a primitive Boolean value.
The Boolean object provides a method for converting the value to a string.
A primitive boolean can have only one of two states: true or false.
JavaScript uses the number 1 to represent true and 0 to represent false but provides the toString() method to return the strings "true" and "false".
A Boolean object is created with the Boolean() constructor and the new operator or by the Boolean() function.
Constructor:
var variable = new Boolean(value)
var variable = Boolean(value)
Boolean Object Verses Primitive Boolean Value
<html>
<script language="JavaScript">
<!--
boolObj = new Boolean("false");
document.write("boolObj = ",boolObj);
document.write(" [",typeof boolObj,"]<br>");
boolVal = Boolean(false);
document.write("boolVal = ",boolVal);
document.write(" [",typeof boolVal,"]");
-->
</script>
</html>
Boolean.prototype
Syntax
Boolean.prototype.property
Boolean.prototype.method
Boolean.toSource()
Syntax
boolean.toSource()
Boolean.toString()
Syntax
boolean.toString()
Boolean.valueOf()
Syntax
boolean.valueOf()