Question

求教！js二维数组中，如何把具有相同种类name的值筛选出来，组成三维数组

具体这样的，比如var college = [[{name:'北京'}, {city:'西安'}],
[{name:'上海'},{city:'包头'}],
[{name:'广州'},{city:'福州'}],
[{name:'北京'},{city:'广州'}],
[{name:'广州'},{city:'太原'}],
[{name:'上海'},{city:'昆明'}]];
要得到这种：
[[
[{name:'北京'}, {city:'西安'}],
[{name:'北京'}, {city:'广州'}]
],
[
[{name:'上海'},{city:'包头'}],
[{name:'上海'},{city:'昆明'}]
],
[
[{name:'广州'},{city:'福州'}],
[{name:'广州'},{city:'太原'}]
]];

Answer 1

var college = [
    [{name:'北京'},{city:'西安'}],
    [{name:'上海'},{city:'包头'}],
    [{name:'广州'},{city:'福州'}],
    [{name:'北京'},{city:'广州'}],
    [{name:'广州'},{city:'太原'}],
    [{name:'上海'},{city:'昆明'}]
];

var result = [];
for(var i = 0;i<college.length;i++){
    var ci = college[i], obj = ci[0];
    var isExisted = false;
    for(var j =0;j<result.length;j++){
        var rj = result[j];
        if(rj.type==obj.name){
            rj.push(ci);
            isExisted = true;
            break;
        }
    }
    if(!isExisted){
        var tmp = [ci];
        tmp.type = obj.name;
        result.push(tmp);
    }
}
college = result;
console.log(college);