You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
16 lines
753 B
16 lines
753 B
// Undefined/null from http://en.wikipedia.org/wiki/JavaScript_syntax
|
|
var testUndefined; // variable declared but not defined, set to value of undefined
|
|
var testObj = {};
|
|
|
|
result = 1;
|
|
if ((""+testUndefined) != "undefined") result = 0; // test variable exists but value not defined, displays undefined
|
|
if ((""+testObj.myProp) != "undefined") result = 0; // testObj exists, property does not, displays undefined
|
|
if (!(undefined == null)) result = 0; // unenforced type during check, displays true
|
|
if (undefined === null) result = 0;// enforce type during check, displays false
|
|
|
|
|
|
if (null != undefined) result = 0; // unenforced type during check, displays true
|
|
if (null === undefined) result = 0; // enforce type during check, displays false
|
|
|
|
|