javascript“for (x in y)”语句
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/7873673/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
javascript "for (x in y)" statements
提问by SiriusKoder
//just copied this code from w3schools
var person={fname:"John",lname:"Doe",age:25};
for (x in person)
{
document.write(person[x] + " ");
}
I want to know that, what I have to assume instead of "x".
我想知道，我必须假设而不是“x”。
采纳答案by Sarfraz
The personis object and Xis variable used in iteration of the forloop, you can name it anything other than Xalso :). Here Xworks as keyof the object for example:
的person是对象，X是在迭代变量使用的for循环，你能说出它比其他任何东西X也:)。这里X可以作为key例如对象：
alert(person["fname"]);
Here fnameis stored in Xalong with other keys such as lnameand age.
Here与其他键一起fname存储，X例如lname和age。
回答by Duncan MacLeod
You want to have
你想拥有
for ( x in Object.keys(person)) {
console.log(person[x]);
}
this will give you a list of KEYS rather than a list of values.
这将为您提供一个键列表而不是值列表。
