单项选择题
var val=’smtg’;console.log(’Valueis’+(val===’smtg’)?’Something’:’Nothing’);()
A.undefined
B.null
C.Something
D.smtg
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function foo() { let a; window.b = 0; a = window.b; a++; return a; } foo(); typeof a; typeof window.b; ()
A.undefined number
B.null number
C.string number
D.以上都不对 -
单项选择题
const length = 4; const numbers = []; var i; for (i = 0; i < length; i++) { // does nothing } { // a simple block numbers.push(i + 1); } console.log(numbers)结果为? ()
A.3
B.null
C.4
D.5 -
单项选择题
function arrayFromValue(items) { return; [items]; } arrayFromValue(10) ()
A.undefined
B.null
C.Boolean
D.number
