从 JavaScript 对象中提取键并用作变量
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Extract keys from JavaScript object and use as variables
提问by
There is a method in PHP called extractwhich does exactly what I want to do here. Say I have an object that looks like this:
PHP 中有一个方法叫做extract，它完全符合我在这里想做的事情。假设我有一个看起来像这样的对象：
var data = {
name: "Olly"
age: 19
};
I want to run a method like extract(data)so that I can then access the properties in that object by just using nameand age, instead of data.nameand data.age.
我想运行一个类似的方法，extract(data)这样我就可以通过使用nameandage而不是data.nameand来访问该对象中的属性data.age。
I've done a bit of Googling and couldn't find anything.
我做了一些谷歌搜索，找不到任何东西。
采纳答案by redShadow
You can use something like this:
你可以使用这样的东西：
function myTestFunction() {
var data = {
name: "Olly",
age: 19,
};
for (var key in data) {
this[key] = data[key];
}
alert(name +" is "+ age +"!");
}
myTestFunction();
(Try that here: http://jsfiddle.net/dHDxd/3/)
（在这里试试：http: //jsfiddle.net/dHDxd/3/）
Or even export them to global namespace, by using window[key] = data[key].
In any case, be very very careful with that, since the risk of clobbering the global namespace / override other stuff / etc. is very high.
甚至可以使用window[key] = data[key]. 在任何情况下，都要非常小心，因为破坏全局命名空间/覆盖其他东西/等的风险非常高。
Update: general-purpose extract()
更新：通用 extract()
function extract(data, where) {
for (var key in data) {
where[key] = data[key];
}
}
function runTest() {
var myData = { name: "Olly", age: 19, };
extract(myData, this);
alert(name +" is "+ age +"!");
}
runTest();
回答by biesiad
Here is more generic/multi-level/recurrent namespace extractor :)
这是更通用/多级/循环命名空间提取器:)
function extract(rootObject, key) {
var parts = key.split('.');
var currentKey = parts.shift();
return parts.length > 0 ? extract(rootObject[currentKey], parts.join('.')) : rootObject[currentKey];
}
var myObject = { a: { b: { c: 7 }}};
console.log(extract(myObject, 'a.b.c'));
console.log(extract(myObject, 'a'));
回答by qrsngky
It seems like it is just like the "with" statement.
似乎就像“with”语句一样。
var data = {
name: "Olly",
age: 19,
};
with(data){
alert(name +" is "+ age +"!"); //"Olly is age 19!"
name = "Charlie";
age = 28;
alert(data.name +" is "+ data.age +"!"); //"Charlie is age 28!"
}
alert(data.name +" is "+ data.age +"!"); //"Charlie is age 28!"
