如何在不同的函数中使用变量？ [英] How to use a variable in a different function?

问题描述

我试图在下面的javascript中打印出latitude（lat）变量。

Im trying to print out the latitude (lat) variable in the javascript below.

如何引用lat变量？ this.lat，that.lat，nearby.lat 等？

How do I refer to the lat variable? this.lat, that.lat, vicinity.lat etc ?

在我的javascript中我有

In my javascript I have

var Vicinity = function (pubReference, sessionId, done, err) {
    this.ad = {
        getBannerHtml: function () {
            console.log(this.lat); // how do I refer to the lat variable?
        }
    };

    this.init = function (done, err) {
        var that = this;
        this.getLatLng(that, function (position) {
            that.lat = position.coords.latitude;
        }, err);
        if (typeof done === 'function')
            done(this);
    };

    this.init(done, err);
};

$(document).ready(function () {
    var data = new Vicinity(pubReference, sessionId,
        function (result) {
            $("#sticky").html(result.ad.getBannerHtml());
        }
    );
});

推荐答案

我已经在另一篇文章中发帖但得到了另一个想法; ）
有点明显但有效。

I already posted in another post but got another idea ;) It is kind of obvious but works.

getBannerHtml: function(lat, lon) {
  return '<iframe src="http://foo.com?pr=34&lat'+ lat +'=&lon=' + lon + '"></iframe>';
}

$(document).ready(function() {
  var pubReference = 1;
  var sessionId = "1";
  var data = new Vicinity (pubReference, sessionId, 
    function(result) {
      $("#sticky").html(result.ad.getBannerHtml(result.lat, result.lon));
    }
  );
});

您还可以使用apply功能调用邻域范围内的getBannerHtml方法。 this变量设置为您传递的对象。

You can also call the getBannerHtml method in the scope of your Vicinity by using the "apply" function. The "this" variable is set to the object you pass.

$(document).ready(function () {
    var pubReference = 1;
    var sessionId = "1";
    var data = new Vicinity(pubReference, sessionId,
        function (result) {
            $("#sticky").html(result.ad.getBannerHtml.apply(result));
        }
    );
});

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