JS里的居民们7-对象和数组转换

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编码

学习通用的数据用不同的数据结构进行存储，以及相互的转换

对象转为数组：

var scoreObject = { "Tony": { "Math": 95, "English": 79, "Music": 68 }, "Simon": { "Math": 100, "English": 95, "Music": 98 }, "Annie": { "Math": 54, "English": 65, "Music": 88 } }

如上有一个用来存储学习成绩的对象，编写一个函数，将其转为如下的二维数组

var scoreArray = [ ["Tony", 95, 79, 68], …… ];

数组转为对象：

var menuArr = [ [1, "Area1", -1], [2, "Area2", -1], [3, "Area1-1", 1], [4, "Area1-2", 1], [5, "Area2-1", 2], [6, "Area2-2", 2], [7, "Area1-2-3", 4], [8, "Area2-2-1", 6], ];

如上有一个用来存储多级菜单数据的数组，编写一个函数，将其转为如下的对象

var menuObject = { "1": { name: "Area1", subMenu: { "3": { name: "Area1-1" }, "4": { name: "Area1-2", subMenu: { "7": { name: "Area1-2-3" } } } } } ……}

<!DOCTYPE html>
<html> <head>
<meta charset="utf-8" />
<title>JS里的居民们9-对象和数组转换</title>
</head> <body>
<script>
//对象转数组
var scoreObject = {
"Tony": {
"Math": 95,
"English": 79,
"Music": 68
},
"Simon": {
"Math": 100,
"English": 95,
"Music": 98
},
"Annie": {
"Math": 54,
"English": 65,
"Music": 88
}
}
var arr1 = [];
for (var i in scoreObject) {
var arr2 = [];
arr2.push(i);
for (var j in scoreObject[i]) {
arr2.push(scoreObject[i][j]);
}
arr1.push(arr2);
}
console.log(arr1);
//数组转对象
var menuArr = [
[1, "Area1", -1],
[2, "Area2", -1],
[3, "Area1-1", 1],
[4, "Area1-2", 1],
[5, "Area2-1", 2],
[6, "Area2-2", 2],
[7, "Area1-2-3", 4],
[8, "Area2-2-1", 6],
]; var menuObject = {};
menuArr.forEach((current, index) => {
if (current[2] == -1) {
menuObject[current[0]] = {
"name": current[1],
"subMenu": {}
}
}
if (current[2] == 1) {
menuObject["1"]["subMenu"][current[0]] = {
"name": current[1],
"subMenu": {}
}
}
if (current[2] == 2) {
menuObject["2"]["subMenu"][current[0]] = {
"name": current[1],
"subMenu": {}
}
}
if (current[2] == 4) {
menuObject["1"]["subMenu"]["4"]["subMenu"][current[0]] = {
"name": current[1],
"subMenu": {}
}
}
if (current[2] == 6) {
menuObject["2"][ "subMenu"]["6"]["subMenu"][current[0]] = {
"name": current[1],
"subMenu": {}
}
}
})
console.log(menuObject);
</script>
</body> </html>