如何在JS 中获取 JSON 对象中某个域的值

Question

问题：如何在JS中获取"内省与专注"对应的score值？
基本情况：
1）JSON 格式化链接
2）JSON 内容

 {"data":[{"id":{"domain":"内省与专注","userName":"guest"},"score":35},{"id":{"domain":"创造力向度指标","userName":"guest"},"score":34},{"id":{"domain":"学校满意度","userName":"guest"},"score":33},{"id":{"domain":"学校激活度","userName":"guest"},"score":35},{"id":{"domain":"学生综合自评分","userName":"guest"},"score":34},{"id":{"domain":"应用向度指标","userName":"guest"},"score":37},{"id":{"domain":"数理逻辑思维","userName":"guest"},"score":37},{"id":{"domain":"沟通与交往","userName":"guest"},"score":34},{"id":{"domain":"理解与表达","userName":"guest"},"score":37},{"id":{"domain":"空间与建构","userName":"guest"},"score":31},{"id":{"domain":"综合动觉协调","userName":"guest"},"score":34},{"id":{"domain":"综合音乐素养","userName":"guest"},"score":33},{"id":{"domain":"观察与实践","userName":"guest"},"score":39},{"id":{"domain":"认知向度指标","userName":"guest"},"score":37},{"id":{"domain":"评价向度指标","userName":"guest"},"score":31}],"success":"true"}

Answer 1

 {"data":[{"domain":"沟通与交往","score":39,"userName":"guest"},{"domain":"观察与实践","score":38,"userName":"guest"},{"domain":"综合音乐素养","score":37,"userName":"guest"},{"domain":"综合动觉协调","score":37,"userName":"guest"},{"domain":"内省与专注","score":35,"userName":"guest"},{"domain":"数理逻辑思维","score":34,"userName":"guest"},{"domain":"空间与建构","score":32,"userName":"guest"},{"domain":"理解与表达","score":32,"userName":"guest"}],"success":"true"}

     var obj;
    var url = "talent/summaryBar";
    var params = {
            username:"guest",
        };  

    $.ajax({ 
        type : "get", 
        url : url, 
        data : params, 
        async : false, 
        success : function(data){
                obj = data;
                /* var str = JSON.stringify( data );
                alert(str);*/
                alert(data.data[0].domain); 
            } 
        });