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想请教一下
你好，Async初学者，感谢无私的分享经验，现在有点迷惑，whilst里demo中的例子是这样的。
var count1 = 0;
async.whilst(
function() { return count1 < 3 },
function(cb) {
log('1.1 count: ', count1);
count1++;
setTimeout(cb, 1000);
},
function(err) {
// 3s have passed
log('1.1 err: ', err); // -> undefined
}
);
想请教，这个cb具体是用传递的么？如果需要传递，请问格式是什么呢？能带参数么？
如果第三个函数 err 不为空 是不是循环就跳出了？
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