1.使用eval解析

   var json_t = {
    '四': {
        '三': {
            '二': {
                '2018/10/8': 8,
                '2018/10/7':7
            }
        }
    },
    'DeploymentId': 4,
    'Serial': 4
};
var obj = eval(json_t);  
console.log(obj.四.三.二); 

2.自定義遍歷函數(shù)

var json_t = {
    '四': {
        '三': {
            '二': {
                '2018/10/8': 8,
                '2018/10/7':7
            }
        }
    },
    'DeploymentId': 4,
    'Serial': 4
};
function GetValues(numcourse,secondKey,thirdKey){
    var  obj =  eval('json_t.'+secondKey);
    console.log(obj);
     var  cc =  eval('obj.'+thirdKey);
     console.log(cc);
    var json = obj.secondKey;
    var values=[];
    for(var key in json){
       values.push(json[key]);
    }
    console.log(values);
    return values;
}
console.log(GetValues(json_t,'四','三'));

3.查看變量屬于哪種類型

  typeof secondKey

4.取json中的key,value

 for (var key in json_t)
    {
        key; ----key
    json[key];  -----value
    }