如何擺脫async.each循環內的異步系列 - node.js

Question

我需要跳過一個async.series的函數或突破，並想知道我應該如何去做。我有一系列需要迭代的項目。我把這個列表放在一個async.each函數中。然後，數組中的每個項目都會在繼續之前通過所需的函數列表（下一個需要從中獲取信息）。但在某些情況下，我只需要通過第一個函數，然後如果不滿足條件（例如，它是我們不使用的類別），那麼回調到下一個項目的async.each循環。這裏是我的代碼示例：

exports.process_items = function(req, res, next){ 
var user = res.locals.user; 
var system = res.locals.system; 
var likes = JSON.parse(res.locals.likes); 
var thecat; 

//process each item 
async.each(items, function(item, callback){ 
    //with each item, run a series of functions on it... 
    thecat = item.category; 

    async.series([ 
    //Get the category based on the ID from the DB... 
    function(callback) { 
     //do stuff 
     callback(); 
    }, 

    //before running other functions, is it an approved category? 
    //if it is not an approved category, SKIP THE OTHER FUNCTIONS IN THE LIST (but how?) 
    function(callback) { 
     //do stuff 
     callback(); 
    }, 

    //some other functionality run on that item, 
    function(callback){ 
     //do stuff 
     callback(): 
    } 


    ], function(err) { 
    if (err) return next(err); 
    console.log("done with series of functions, next item in the list please"); 
}); 

//for each like callback... 
callback(); 

}, function(err){ 
    //no errors 
    }); 
} 

Answer 1

將退出快捷方式放在相關函數的頂部。例如：

async.series([ 
    //Get the category based on the ID from the DB... 
    function(callback) { 
     //do stuff 
     callback(); 
    }, 

    //before running other functions, is it an approved category? 
    //if it is not an approved category, SKIP THE OTHER FUNCTIONS IN THE LIST (but how?) 
    function(callback, results) { 
     if (results[0] is not an approved category) return callback(); 
     //do stuff 
     callback(); 
    },