Created
November 18, 2013 18:35
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顺序处理批量任务
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/** | |
* @arr 待处理数组 | |
* @handler 处理函数 | |
*/ | |
function handleBatch(arr, handler) { | |
// 参数校验 | |
if (!arr || arr.length == 0 || !handler) return; | |
// 如果没有回调,则直接用循环; | |
// 否则,在处理完当前项后,在回调函数中处理下一个项。 | |
if (handler.length == 1) { | |
arr.forEach(function(item) { | |
handler(item); | |
}); | |
} | |
else if (handler.length == 2) { | |
var handleOne = function(start, arr, handler) { | |
handler(arr[start], function() { | |
if (start + 1 < arr.length) { | |
handleOne(start + 1, arr, handler); | |
} | |
}); | |
}; | |
handleOne(0, arr, handler); | |
} | |
} |
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