从Promise返回值

如果您依赖承诺来返回数据，则必须从函数中返回承诺。

一旦调用堆栈中的1个函数异步，那么要继续线性执行，所有要调用它的函数也必须异步。（异步=返回承诺）

请注意，您的

if

我在此示例中对其进行了修复。请注意我添加的备注。

if(address){    promise=Q($.ajax({        type: "GET",        url: "https://maps.googleapis.com/maps/api/geopre/json?address=" + address + "&key=API_KEY"    }));    return promise.then(function(data) {        // whatever you return here will also become the resolve value of the promise returned by makeGeoCodingRequest        // If you don't want to validate the data, you can in fact just return the promise variable directly        // you probably want to return a rejected promise here if status is not what you expected        if (data.status === "OK") return data; else console.error(messages[data.status]);        return null;        });}

您必须

makeGeoCodingRequest

makeGeoCodingRequest(address,bounds).then(function(data){    // this will contain whatever     console.log(data);});