Question

我有这个对象，我想将它的值打印到控制台：

var PageStatistics = function (page) {
 var myFunctionName = function ()
    {
      //some logic of operation

      //i want to print to the console the current object state to see if my logic works
      console.log(this);
    }
}

但是在查看控制台时，我会看到一个包含所有窗口详细信息的“窗口”，而不是PageStatistics的对象。

如何返回PageStatistics的当前实例？

更新：添加了一些实际代码 此代码从Facebook API查询获得响应，以计算有关页面行为的一些统计信息：

var PageStatistics = function (page) {
    var numberOfPosts = 0;
    var numberOfLikes = 0;
    var numberOfComments = 0;
    var numberOfShares = 0;
    var bestPostId = 0;
    var bestPostLikes = 0;
    var bestPostComments = 0;
    var bestPostShares = 0;
    var bestPostTotalEngagement = 0;

    this.onFacebookDataLoaded = function (posts) {
        var data = posts["data"];
        console.log(posts);
        for (var i = 0; i < data.length; i++) {
            var post = data[i];
            var postIds = post["id"].split("_");
            var postId = postIds[1];
            //TODO add feature for excluding array of posts

            numberOfPosts++;
            var likes = 0;
            var comments = 0;
            var shares = 0;
            if (isVariableExists(post["likes"]) && isVariableExists(post["likes"]["summary"]) && isVariableExists(post["likes"]["summary"]["total_count"]))
                likes = post["likes"]["summary"]["total_count"];
            if (isVariableExists(post["comments"]) && isVariableExists(post["comments"]["summary"]) && isVariableExists(post["comments"]["summary"]["total_count"]))
                comments =post["comments"]["summary"]["total_count"];
            if (isVariableExists(post["shares"]) && isVariableExists(post["shares"]["count"]))
                shares = post["shares"]["count"];
            numberOfLikes += likes;
            numberOfComments += comments;
            numberOfShares += shares;
            totalEngagement = likes + comments + shares;
            if (bestPostTotalEngagement < totalEngagement)
            {
                bestPostId = post["id"];
                bestPostLikes = likes;
                bestPostComments = comments;
                bestPostShares = shares;
                bestPostTotalEngagement = totalEngagement;
            }
        }
        //if the results have a next page - set the path to take it from there
        if (isVariableExists(posts["paging"]) && isVariableExists(posts["paging"]["next"]))
        {
            var next = posts["paging"]["next"];
            var pos = next.indexOf("/posts");
            var path = page.id + next.substr(pos);
            //Here is need to send another function my instance to continue to update it
            FacebookManager.getPageStatistics(page,this,path);
        }
       //here i want to check what we have gathered so far.
        console.log(this);
    }

    /**
     * Check if a variable exists
     * @param variable the variable to check
     * @returns {boolean} true if exists, false otherwise
     */
    var isVariableExists = function (variable) {
        if (typeof variable !== 'undefined')
            return true;
        return false;
    }

}

Answer 1

我认为你正在寻找一些想法

    var PageStatistics = function (page) {
    this.myVariableName = '';
    var mySecondVariable = '';
    this.myFunctionName = function ()
    {
        //some logic of operation
        this.myVariableName = 'something';
        mySecondVariable = 'second something';
        //now this will return refrence of myVariableName variable and myFunctionName function, not of mySecondVariable
        console.log(this);
    }
}

var test = new PageStatistics();
test.myFunctionName();

Answer 2

创建您的函数，然后实例化它。

像这样：

var PageStatistics = function () {
    this.myFunctionName = function (){
      console.log(this);
    }
}
var ps = new PageStatistics;
console.log(ps.myFunctionName); // myFunctionName
ps.myFunctionName.call(ps); // PageStatistics

Javascript - 对象返回自身

2 个答案: