如何从 jquery ajax 请求中获取返回数据?

问题描述

function isNewUsername(str){
    var result;
    $.post('/api/isnewusername',
            {username:str},
            function(data) {
                result = data.result;
            },
            "json");
    return result;
}

所以，我的问题很简单，但我想不通.我想从 isnewusername 函数访问结果.我对答案很好奇，因为我花了 1 小时在上面.谢谢

So , my problem is very simple but I can not figure it out . I want to access result from the isnewusername function . I am very curious about answer because I spent 1 hour on it .Thank you

推荐答案

作为使用 jQuery post 函数 您正在使用 jQuery ajax 函数的简写形式 这意味着您正在进行异步调用.因此，只有在成功响应时，jQuery 才会调用您的函数，并将服务器端调用的结果放入成功回调的 data 参数中.

As a quick note when you use the jQuery post function you are using a shorthand form of the jQuery ajax function which means you are doing an asynchronous call. Therefore only on a successful response is jQuery going to call your function and put the result from your server side call in the data parameter of your success callback.

举例说明:

function isNewUsername(str){
    $.post('/api/isnewusername',
            {username:str},
            function(data) {
                alert(data.result);
            },
            "json");
}

也就是说，您可以更改代码以指定 同步回调 但这有可能锁定用户浏览器，直到请求返回.

That said you can change your code to specify a synchronous callback but that has the potential to lock the users browser until the request is returned.

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