async callback要執行完才會進到一下個序列
<a href="http://stackoverflow.com/questions/23864052/async-eachseries-in-node-js">async.eachSeries in node.js</a>
async callback要執行完才會進到一下個序列
<a href="http://stackoverflow.com/questions/23864052/async-eachseries-in-node-js">async.eachSeries in node.js</a>
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