JavaScript: The Complete Reference, Second Edition

U

u object, HTMLElement, 901

<u>, 901

UI ( user interface) events, DOM2, 336 “337

ul object, UListElement, 901

<ul>, 901

UListElement, 901

unary operator, 81, 740

undefined data type, 58 “60

conversion of, 734

defined, 29

vs. null data type, 59 “60

overview of, 58 “59

undefined values, 113, 745

unescape ( ) method, strings, 180

Unicode character set, 54 “55

unshift( ) method, arrays, 166

untyped languages, 48

URL

href property, 392

Location object for accessing, 366

URL property, Document object, 388

user interface (UI) events, DOM2, 336 “337

userAgent property, Navigator object, 536, 538 “539

user-defined objects, 133 “134, 147 “148, 754

userProfile object, 901 “902

users, privacy protection, 682

UTC (Coordinated Universal Time), 174