向JSON对象添加新的数组元素

Question

我有一个从JSON文件读取的JSON格式对象，该对象包含在一个名为teamJSON的变量中，如下所示： {"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}我想向数组添加一个新项，例如{"teamId":"4","status":"pending"}最终{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}在写回文件之前。什么是添加到新元素的好方法？我接近了，但是所有的双引号都被转义了。我一直在寻找一个很好的答案，但是没有一个案例能解决这个问题。任何帮助表示赞赏。

Answer 1

JSON只是一种表示法；进行所需的更改parse，以便可以将更改应用于本机JavaScript对象，然后stringify返回JSON

var jsonStr = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';

var obj = JSON.parse(jsonStr);

obj['theTeam'].push({"teamId":"4","status":"pending"});

jsonStr = JSON.stringify(obj);

// "{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"

Answer 2

var Str_txt = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';

如果要添加到最后一个位置，请使用以下命令：

var parse_obj = JSON.parse(Str_txt);

parse_obj['theTeam'].push({"teamId":"4","status":"pending"});

Str_txt = JSON.stringify(parse_obj);

Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"

如果要添加到第一个位置，请使用以下代码：

var parse_obj = JSON.parse(Str_txt);

parse_obj['theTeam'].unshift({"teamId":"4","status":"pending"});

Str_txt = JSON.stringify(parse_obj);

Output //"{"theTeam":[{"teamId":"4","status":"pending"},{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}"

任何想要在数组的特定位置添加的人都可以尝试以下操作：

fruits['theTeam'].splice(2, 0, {"teamId":"4","status":"pending"});

Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"4","status":"pending"},{"teamId":"3","status":"member"}]}"

上面的代码块在第二个元素之后添加一个元素。