JS中未显示Ajax响应

Question

I have an AJAX script like this

function savetoDB(inp) {
    var userID = (FB.getAuthResponse() || {}).userID;

    jQuery.ajax({
        url: URL,
        type: 'GET',
        data:{ 'input': JSON.stringify(inp) },
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        async: true,
        success: function(msg) {
            console.log(msg);
            alert(msg);
        }
    });
}

The problem I am facing is that the php returns (echo's) some string , but I am unable to see it in alert. I used the inspect element and Inside inspect element I can see the Response, and also the status is 200, what could be the reason that it is not showing the response in alert?

Answer 1

You are returning a JSON object, so it won't show in alert, which only displays strings. Convert it to a string first:

success: function(msg) {
    console.log(msg);
    alert(JSON.stringify(msg));
}

Answer 2

将“ URL”替换为您要从中提取数据的文件的实际URL，否则您将收到空响应。