我知道有关该主题的其他文章,但似乎并没有解决我的问题:link。
我希望能够动态获取对象中特定属性的名称,以便可以使用它在另一个对象中创建新的属性名称。例如,我将从startMin
获得属性名称foo
(如下面的代码所示),然后在其末尾添加文本(例如startMin + Suffix
)以创建新的属性名称。我怎样才能做到这一点?
相关说明:我已经想出了如何使用foo[Object.keys(foo)[0]]
获取属性值。尽管这可行,但我不确定为什么在这种情况下Object.keys
获得属性值,因为我发现的示例建议Object.keys
应该获得属性名称而不是属性值。我想知道为什么吗?
我包括了pusdo代码foo[Object.returnObjectName(foo)[0]] + 'Cal'
,我想在其中动态创建名称。当然不行。
var foo = {
startMin: 1000
};
var fooResults = {
// the property name here is psudo code
foo[Object.returnObjectName(foo)[0]] + 'Cal': foo[Object.keys(foo)[0]]
}
console.log('startMinCal: ' + fooResults.startMinCal) // This should log "1000" but won't until the object name inside `fooResults` is created correctly.
//
console.log(Object.keys(foo)); // I believe this gests the property name, but it exists inside an array, so won't work as a new property name
console.log(foo[Object.keys(foo)[0]]); // this gets the property value as expected.
更新的工作代码:
var foo = {
startMin: 1000,
startMax: 3000
};
var fooResults = {
[Object.keys(foo)[0] + 'Cal']: foo[Object.keys(foo)[0]],
[Object.keys(foo)[1] + 'Cal']: foo[Object.keys(foo)[1]]
}
console.log('startMinCal: ' + fooResults.startMinCal)
console.log('startMaxCal: ' + fooResults.startMaxCal)
答案 0 :(得分:1)
var foo = {
startMin: 1000
};
//Object.keys return all the keys in an object passed as parameter
//here your wanted key is at first position
var key = Object.keys(foo)[0];
//get the value
var value = foo[key]
//append whatever suffix you want
key += 'Cal';
var fooResults = {
//to use content of variable as key of object put variable in []
[key]: value
}
//another solution
//create emtyy object
var fooResults2 = {}
//use use variable name as index
fooResults2[key] = value
console.log('startMinCal: ' + fooResults.startMinCal) // This should log "1000" but won't until the object name inside `fooResults` is created correctly.
console.log('startMinCal: ' + fooResults2.startMinCal)