单项选择题
A.cos(x)B.sqrt(x)C.sin(x)D.round(x)
A.number setTimeout(function callback,number delay,any rest)B.number setInterval(function callback,number delay,any rest)C.clearTimeout(number timeoutID)D.clearInterval(number intervalID)
A.number setInterval(function callback,number delay,any rest)B.clearTimeout(number timeoutID)C.number setTimeout(function callback,number delay,any rest)D.clearInterval(number intervalID)
A.slice()B.unshift()C.splice()D.sort()
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