Index_U

U

undefined value, variables , 73

underscore , properties, 308

unload event handler, 33

unShift function, 196 “197

updateAfterEvent function, 289

updating. See timing

URLs, 15

user -defined functions

arguments, 89 “91

creating, 88 “89

overview, 88 “89

return values, 91 “92

variables, 90 “91