A.*等同{1，}
B.+等同{0，}
C.？等同{0，1}
D.\W等同[0-9A-Za-z_]

A.100
B.100.56
C.NaN
D.80

A.123100abc
B.123.5abc100abc
C.NaN
D.223

A.150undefinedNaN
B.NaN
C.150undefined
D.10050undefinedNaN

A.3
B.6
C.5
D.0

A.1，2，3
B.1，2，3，4
C.2，3，4
D.2，3，4，5

A. alert(new Date(2011 , 12 , 25).getDay());
B. alert(new Date(2011 , 12 , 25 , 5).getDay());
C. alert(new Date(2011 , 12 , 25 , 5 , 5 , 9).getDay());
D. 以上三个结果都正确

A.100
B.100.1
C.NaN
D.undefined

A.123abc123
B.123abc
C.123
D.abc

A.function150NaN
B. function10050NaN
C. undefined10050NaN
D. NaN

A.onMouseout
B.onmouseover
C.onclick
D.onsubmit