本文介绍了JSON.stringify序列化为[[]]的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

如果我创建一个JavaScript对象,如:

If I create a JavaScript object like:

var lst = [];
var row = [];
row.Col1 = 'val1';
row.Col2 = 'val2';
lst.push(row);

然后将其转换为字符串:

And then convert it to a string:

JSON.stringify(lst);

结果是一个包含空对象的对象:

The result is an object containing an empty object:

[[]]

我希望它序列化如:

[[Col1 : 'val1', Col2: 'val2']]

为什么内部对象属性不能序列化?

Why do the inner objects properties not serialize?

推荐答案

因为 row 是一个数组,而不是一个对象。将其更改为:

Because row is an array, not an object. Change it to:

var row = {};

这会创建一个对象文字。然后,您的代码将生成一个对象数组(包含单个对象):

This creates an object literal. Your code will then result in an array of objects (containing a single object):

[{"Col1":"val1","Col2":"val2"}]

更新

要了解到底发生了什么,你可以看看。这是来自 str 函数的(大大减少)片段(由 JSON.stringify 调用):

To see what really happens, you can look at json2.js on GitHub. This is a (heavily reduced) snippet from the str function (called by JSON.stringify):

if (Object.prototype.toString.apply(value) === '[object Array]') {
    //...
    length = value.length;
    for (i = 0; i < length; i += 1) {
        partial[i] = str(i, value) || 'null';
    }
    //...
}
//...
for (k in value) {
    if (Object.prototype.hasOwnProperty.call(value, k)) {
        //...
    }
    //...
}
//...

请注意,对于循环使用正常的迭代数组,它只枚举数组元素。使用 for 循环迭代对象,使用 hasOwnProperty 测试以确保proeprty实际属于这个对象。

Notice that arrays are iterated over with a normal for loop, which only enumerates the array elements. Objects are iterated with a for...in loop, with a hasOwnProperty test to make sure the proeprty actually belongs to this object.

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07-30 09:57