933. 最近的请求次数

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var RecentCounter = function() {
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    this.queue = []
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};
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/**
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 * @param {number} t
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 * @return {number}
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 */
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RecentCounter.prototype.ping = function(t) {
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    this.queue.push(t)
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    const queueHead = this.queue[0]
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    while(queueHead < t-3000) {
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        this.queue.shift();
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    }
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    return this.queue.length
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};