JavaScript resolves asynchronous sequential execution issues

When you begin to invoke data asynchronously with a For loop, it is discovered that asynchronous execution occurs after the for loop. Of course, the results are not what I want to get.

In general this situation: we can solve the problem by the following method

1. JQuery $ajax

Set the Ajax parameter async to False, that is, with JS synchronization, the default is True (async).

for (int i = 0; i < 5; i++) {

var html= $.ajax ({url:url,async:false}). responsetext;

}

2, can be implemented by recursive method, when the asynchronous execution is done after the function of the call itself

$scope. goodslist = [];

function GetProducts (nameindex) {

for (Var i=0;i<name.length;i++) {//original for loop notation get data sort not fixed

var product = new AV. Query (' Product ');

Product Type

var Cid = new AV. Query (' classify ');

Cid.equalto ("GJZ", Name[nameindex]);

Cid.find (). Then (function (res) {

Product.equalto ("CID", parseint (res[0].id));

Product.equalto ("status", 1);

Product.descending ("Updatedat");

Product.limit (4);

var results = [];

Product Enquiry

Product.find (). Then (function (res2) {

Angular.foreach (Res2, function (result, index) {

var oo = Result.tojson ();

Oo.picurlarray = Angular.fromjson (Oo.picurlarray);

Oo.activename = Res[0].tojson (). title;

Oo.activenameen = Res[0].tojson (). GJZ;

for (var key in Oo.spec) {

$scope. $apply (function () {

Oo.product = Oo.spec[key];

Results.push (OO);

});

Break

}

});

$scope. Goodslist.push (results);

Console.log ($scope. goodslist);

/*

* Recursive implementation of asynchronous data before calling its own function

*/

nameindex++;

if (nameindex<name.length)

GetProducts (Nameindex);

Else

Return

});

});

//                }

}

Indeed recommended, really hot, points merchandise, indeed good gift, sure enough special

var name = ["Grtj", "GRRM", "JFSP", "Grhl", "Grtjia"];

var nameindex = 0;

GetProducts (Nameindex);

JavaScript resolves asynchronous sequential execution issues