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单项选择题
A.5
B.10
C.null
D.undefined
单项选择题
A.false true
B.true false
C.false false
D.true true
单项选择题
A.arr[arr.length]=x
B.arr.length+arr=x
C.arr+[arr.length]=x
D.Array.pop(arr,x)
单项选择题
A.["eggs","milk","cookies"]
B.["eggs","bread"]
C.["eggs","milk","bread","cookies"]
D.["milk","bread"]
单项选择题
A.全不正确
B.varc=a.push()+b.push()
C.varc=a.concat(b)
D.varc=a.join(b)
单项选择题
A.抛出SyntaxError错误
B.x="Hellofromfoo";y="Iamglobaly"
C.x="Iamglobalx";y="Iamglobaly"
D.x="Hellofromfoo";y="Hellofromfoo"