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// Promise race实现
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Promise._race = function (taskArr) {
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  return new Promise((resolve, reject) => {
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    for (const iterator of taskArr) {
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      Promise.resolve(iterator).then((data) => {
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        resolve(data);
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      }, (err) => {
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        reject(err);
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        return
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      })
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    }
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  })
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}