JavaScript：如何使用两个相同的键迭代对象（并获得两个值）
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JavaScript: How to iterate object with two the same keys (and get two values)
提问by WHITECOLOR
var obj = { key: value1, key: value2}
I would like to iterate it and get pars of (key and value1) and (key and value2)
我想迭代它并获取 (key and value1) 和 (key and value2) 的解析
if I use simple cycle:
如果我使用简单循环：
for (var i in obj){
console.log(obj[i])
}
I got: key value2 key value2
我得到：key value2 key value2
so obj[i] always take last key
所以 obj[i] 总是取最后一个键
回答by vzwick
Keys in JS objects must be unique.
JS 对象中的键必须是唯一的。
What happens, is:
发生的事情是：
var obj = {
key : value1
}
sets obj['key']to value1.
设置obj['key']为value1。
The subsequent declaration of key : value2overwritesyour previous one.
随后的声明将key : value2覆盖您之前的声明。
Possible solution to your problem:
您的问题的可能解决方案：
var obj = {
key : [value1, value2]
}
for (var i in obj)
{
if (obj[i] instanceof Array)
{
for (var k; k < obj[i].length; k++)
{
console.log(obj[i][k])
}
}
else
{
console.log(obj[i]);
}
}
Another, possibly more elegant, solution would be to modify the way you store your data like so:
另一个可能更优雅的解决方案是修改您存储数据的方式，如下所示：
var obj = [
{ key : 'SomeKey' , value : 'foo' },
{ key : 'SomeKey' , value : 'bar' },
{ key : 'SomeOtherKey', value : 'baz' }
];
This obviously allows for multiple entries with the same key. The querying could be done somewhere along these lines:
这显然允许具有相同密钥的多个条目。查询可以按照以下方式在某处完成：
values = [];
for (var i = 0; i < obj.length; i++)
{
if (obj[i].key === 'SomeKey')
{
values.push(obj[i].value);
}
}
console.log(values);
回答by saji89
This is not possible. As in the declaration:
这不可能。如声明中所述：
var obj = { key: value1, key: value2}
Initially obj.key is set as value1, in the second assignment value1is rewritten with value2, So, obj.key is now value2.
So you cannot access the initial value.
最初 obj.key 设置为value1，在第二个赋值中value1被重写为value2，所以， obj.key 现在是value2。
所以你不能访问初始值。
