“意外的令牌o”使用$ .parseJSON时 [英] "Unexpected token o" when using $.parseJSON

问题描述

以下ajax调用给出以下结果：

The following ajax call gives the following result:

    $.ajax({
        type: "POST",
        url:  //**My full URL goes here**,
        data: {sources: sources},
        dataType: "json",
        success: function(data) {
            alert(data);
            alert(data.length);
            for (var i = 0; i < data.length; i++)
            {
                alert(data[i]);
            }
        }
    });

结果：

data:
[objject object],[objject object],[objject object]

length:
3

in loop:
[objject object]
[objject object]
[objject object]

以及我刚刚添加的以下代码：

and the following code , in which I just added:

var data = $.parseJSON(data);
$.ajax({
    type: "POST",
    url:  //**My full URL goes here**,
    data: {sources: sources},
    dataType: "json",
    success: function(data) {
        var data = $.parseJSON(data);
        alert(data);
        alert(data.length);
        for (var i = 0; i < data.length; i++)
        {
            alert(data[i]);
        }
    }
});

上面的代码给出了以下错误：

The above code gives me the following error:

未捕获的语法错误：意外的令牌o

Uncaught Syntax Error: Unexpected token o

为什么会这样？难道我做错了什么？我该如何解决？

Why is that? Am I doing something wrong? How can I fix it?

推荐答案

数据已经过解析对象，因为你传递 dataType：'json'，所以不需要再次解析它。

The data is already a parsed object since you are passing dataType: 'json', so there is no need to parse it again.

再次要调试和检查数据的值，请改用控制台日志记录 alert（），如 console.log（data）

Again to debug and inspect the value of data, use console logging instead of alert(), like console.log(data)

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