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【单选题】
在JavaScript中，window对象的setInterval()方法与setTimeout()方法的区别在于。()
A.
setTimeout()方法需要浏览者终止定时，而setInterval()方法不必这样
B.
setInterval()方法用于每隔一定时间重复执行一个函数，setTimeout()方法用于一定时间之后执行一次函数
C.
setInterval()方法用于每隔一定时间在屏幕上散过一条广告，而setTimeout()方法则很自由
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