Question

我有一个包含多个函数的对象InsertDB。我想一个接一个地执行。

仅当功能1 InsertDB.addNot(); 完成循环，插入记录等时，才执行功能2 InsertDB.addBk(); 。

// Object with 7 functions to be called. Each performs a loop and insert records into IndexedDB

InsertDB = {
addBk: function(Object) {
    if (Object.hasOwnProperty("Books")) {
        for (var i = 0, j = Object["Books"].length; i < j; i++) {
            server.Books.add({
                title: Object["Books"][i].id,
                content: Object["Books"][i]
            });
        }
    }
},
addNot: function(Object) {
    if (Object.hasOwnProperty("Notifications")) {
        for (var i = 0, j = Object["Notifications"].length; i < j; i++) {
            server.Notifications.add({
                content: Object["Notifications"][i]
            });
        }
    }
} etc...
}


//On Ajax success event, run above functions one after the other as described above.

Synchronize = {
Start: function(){
 return $.ajax({
      ......
     success: function(data){
        var Object = $.parseJSON(data);
        InsertDB.addBk(Object);
        InsertDB.addNot(Object);
        InsertDB.addUser(Object);
        InsertDB.addHistory(Object);  ect...          



    }
 }};

Synchornize.Start();

Answer 1

您应该实现这些功能，以便它们返回承诺，然后您可以订阅这些承诺。您可以使用jQuery或q.js。

Answer 2

正如Tommi所说，我必须确保函数返回promises然后我可以在所有迭代完成时触发事件，我的确如下：

InsertDB = {
addBk: function(Object) {
if (Object.hasOwnProperty("Books")) {

   var promises = [],p; 

    for (var i = 0, j = Object["Books"].length; i < j; i++) {
       p = server.Books.add({
            title: Object["Books"][i].id,
            content: Object["Books"][i]
        });

   promises.push(p); 

    }

$.when.apply($, promises).done(function() {
       // callback function when all iterations are finished
    });

  }
}

执行多个功能

2 个答案: