我想像这样转换一个对象:
{"1":5,"2":7,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10":0,"11":0,"12":0}
输入一个键值对数组,如下所示:
[[1,5],[2,7],[3,0],[4,0]...].
如何将对象转换为JavaScript中的键值对数组?
我想像这样转换一个对象:
{"1":5,"2":7,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10":0,"11":0,"12":0}
输入一个键值对数组,如下所示:
[[1,5],[2,7],[3,0],[4,0]...].
如何将对象转换为JavaScript中的键值对数组?
当前回答
下面是es6使用扩展操作符和Object.entries的“新”方法。
const data = {"1":5,"2":7,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10":0,"11":0,"12":0};
const dataSpread = [...Object.entries(data)];
// data spread value is now:
[
[ '1', 5 ], [ '2', 7 ],
[ '3', 0 ], [ '4', 0 ],
[ '5', 0 ], [ '6', 0 ],
[ '7', 0 ], [ '8', 0 ],
[ '9', 0 ], [ '10', 0 ],
[ '11', 0 ], [ '12', 0 ]
]
其他回答
下面是es6使用扩展操作符和Object.entries的“新”方法。
const data = {"1":5,"2":7,"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"10":0,"11":0,"12":0};
const dataSpread = [...Object.entries(data)];
// data spread value is now:
[
[ '1', 5 ], [ '2', 7 ],
[ '3', 0 ], [ '4', 0 ],
[ '5', 0 ], [ '6', 0 ],
[ '7', 0 ], [ '8', 0 ],
[ '9', 0 ], [ '10', 0 ],
[ '11', 0 ], [ '12', 0 ]
]
使用对象。以键值格式获取Object的每个元素,然后像这样映射它们:
var obj = {“1”:5,“2”:7,“3”:0,“4”:0,“5”:0,“6”:0,“7”:0,“8”:0,“9”:0,“10”:0,“11”:0,“12”:0} var res = Object.entries(obj).map(([k, v]) => ([Number(k), v])); console.log(res);
但是,如果你确定键是按递进顺序排列的,你可以使用Object。values和Array#map来做这样的事情:
var obj ={“2”,“1”:5:7,“3”:0,“4”:0,“5”:0,“6”:0,“7”:0,“8”:0,“9”:0,“10”:0,“11”:0,“12”:0}; // idx是索引,你可以使用任何逻辑来增加它(从0开始) let result = Object.values(obj)。Map ((e, idx) => ([++idx, e])); console.log(结果);
使用lodash,除了上面提供的答案外,还可以将键放在输出数组中。
输出数组中没有对象键
for:
const array = _.values(obj);
如果obj为以下内容:
{ “art”: { id: 1, title: “aaaa” }, “fiction”: { id: 22, title: “7777”} }
那么数组将是:
[ { id: 1, title: “aaaa” }, { id: 22, title: “7777” } ]
使用输出数组中的对象键
如果你写('genre'是你选择的字符串):
const array= _.map(obj, (val, id) => {
return { ...val, genre: key };
});
你会得到:
[
{ id: 1, title: “aaaa” , genre: “art”},
{ id: 22, title: “7777”, genre: “fiction” }
]
我们可以将数字改为字符串类型的键如下所示:
var obj = {“1”:5,“2”:7,“3”:0,“4”:0,“5”:0,“6”:0,“7”:0,“8”:0,“9”:0,“10”:0,“11”:0,“12”:0} var result = Object.keys(obj).map(function(key) { 返回 [字符串(键), 对象[键]]; }); 控制台.log(结果);
你可以使用3个方法将对象转换为数组(任何人都可以参考,不仅是这个问题(第三个是最合适的,回答这个问题) 种(),Object.values (), andObject.entries ()
3种方法的示例
使用种()
const text= {
quote: 'hello world',
author: 'unknown'
};
const propertyNames = Object.keys(text);
console.log(propertyNames);
result
[ 'quote', 'author' ]
使用Object.values ()
const propertyValues = Object.values(text);
console.log(propertyValues);
结果
[ 'Hello world', 'unknown' ]
使用Object.entires ()
const propertyValues = Object.entires(text);
console.log(propertyValues);
结果
[ [ 'quote', 'Hello world' ], [ 'author', 'unknown' ] ]