创建地图对象角度js

Question

我有一张地图daySubjects和subject数组我还有days数组来存储＆＃39; Sunday to Saturday＆＃39; 我必须使用这些变量

创建这样的json

{
"daySubjects": {
    "MONDAY": {
        "subject": [

        ]
    },
    "TUESDAY": {
        "subject": [

        ]
    },
    "WEDNESDAY": {
        "subject": [

        ]
    },
    "THURSDAY": {
        "subject": [

        ]
    },
    "FRIDAY": {
        "subject": [

        ]
    },
    "SATURDAY": {
        "subject": [

        ]
    },
    "SUNDAY": {
        "subject": [

        ]
    }
}

}

Answer 1

好的，如果我正确理解了qustion，这里是简单的javascript代码示例：

var days = ["sun","mon","tue","wed","thu","fri","sat"];
var result = {
    daySubjects : {}
};
days.forEach(
    function(i){ 
        result.daySubjects[i] = { subject:[] };
    }
);

执行此行后，结果对象将包含：

{
    "daySubjects": {
        "sun": {
            "subject": []
        },
        "mon": {
            "subject": []
        },
        "tue": {
            "subject": []
        },
        "wed": {
            "subject": []
        },
        "thu": {
            "subject": []
        },
        "fri": {
            "subject": []
        },
        "sat": {
            "subject": []
        }
    }
}

在javascript中，您必须注意定义您引用的对象。例如：

var test = {};

// fails because test.x is not defined
test.x[0] = 10;

//works cause you create array object before using it
test.x = [];
test.x[0] = 10;

更简单的是，您可以一次定义整个嵌套的JSON对象结构。