jQuery.ajax #get之后出现意外的令牌冒号JSON [英] Unexpected token colon JSON after jQuery.ajax#get

问题描述

我在 nodejs 上创建了一个简约API，它以JSON格式返回数据。

I have created a minimalist API on nodejs which return data in JSON format.

但每次我尝试制作一个ajax＃接到电话并将我的API作为网址传递，我会收到错误并从Chrome判断，我收到意外的令牌：错误;

But every time I try to make a ajax#get call and pass my API as URL, I will get an error and judging from Chrome, I'm getting a "Unexpected token :" error;

此处 nodejs 中的服务器代码快递：

var
 http    = require( 'http' ),
 express = require( 'express' ),
 app      = express(),
 server  = http.createServer( app );

app.get( '/', function( req, res ) {
    console.log( 'req received' );
        res.setHeader('Content-Type', 'application/json');
    res.end( JSON.stringify({
    Name : "Tom",
    Description : "Hello it's me!"
    }) );

});

server.listen(3000, function() {
    console.log( 'Listening on 3000' );
});

从/返回的JSON是： {姓名：汤姆，描述：你好，是我！} 。

The JSON returned from "/" is: {"Name":"Tom","Description":"Hello it's me!"}.

以下是来自客户js的电话：

Here is my call from the client js:

$.ajax({
    url: findUrl,
    type: 'get',
    dataType: 'jsonp',
    success: function ( data ) {
        self.name( data.Name );
        self.description( data.Description );
    },
    error: function( jqXHR, textStatus, errorThrown ) {
        alert(errorThrown);
    }
});

在绘制错误时我得到：jQuery111108398571682628244_1403193212453未被调用

When plotting the error I get: "jQuery111108398571682628244_1403193212453 was not called"

有人可以帮助我吗？

我知道这个问题已被提出但是我无法找到解决方案来修复我的程序。

I know this question has been asked already but I haven't manage to find a solution which fix my program.

推荐答案

支持 JSONP请求，服务器必须包含 P 或 Padding ，在回复中。

To support JSONP requests, the server will have to include the P, or "Padding," in the response.

jQuery111108398571682628244_1403193212453({"Name":"Tom","Description":"Hello it's me!"})

语法错误，意外的令牌：，是因为JSONP被解析为JavaScript，其中<​​code> {...} 也代表块。它只是利用JSON和JavaScript的类似语法来定义传递给全局函数调用的数据。

The syntax error, "Unexpected token :", is because JSONP is parsed as JavaScript, where {...} also represents blocks. It just takes advantage of JSON and JavaScript's similar syntax to define the data being passed to a global function call.

默认情况下，jQuery将包含 callback 带有函数名称的query-string参数：

By default, jQuery will include a callback query-string parameter with the name of the function:

var callback = req.query.callback;
var data = JSON.stringify({
    Name : "Tom",
    Description : "Hello it's me!"
});

if (callback) {
    res.setHeader('Content-Type', 'text/javascript');
    res.end(callback + '(' + data + ')');
} else {
    res.setHeader('Content-Type', 'application/json');
    res.end(data);
}

ExpressJS还包括 res.jsonp（） ：

ExpressJS also includes res.jsonp() that already implements this condition:

app.get( '/', function( req, res ) {
    console.log( 'req received' );

    res.jsonp({
        Name : "Tom",
        Description : "Hello it's me!"
    });
});

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