javascript 如何将关联数组加入字符串
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How to join an associative array into a string
提问by ali
I am trying to do this now and I wonder if there is a "the most used" method to join an associative array (it's values) into a string, delimited by a character.
我现在正在尝试这样做，我想知道是否有一种“最常用”的方法可以将关联数组（它的值）连接到由字符分隔的字符串中。
For example, I have
例如，我有
var AssocArray = { id:0, status:false, text:'apple' };
The string resulted from joining the elements of this object will be
连接这个对象的元素产生的字符串将是
"0, false, 'apple'" or "0, 0, 'apple'"
if we join them with a "," character Any idea? Thanks!
如果我们用“，”字符加入它们 有什么想法吗？谢谢！
采纳答案by Hidde
Just loop through the array. Any array in JavaScript has indices, even associative arrays:
只需循环遍历数组。JavaScript 中的任何数组都有索引，甚至是关联数组：
var AssocArray = { id:0, status:false, text:'apple' };
var s = "";
for (var i in AssocArray) {
s += AssocArray[i] + ", ";
}
document.write(s.substring(0, s.length-2));
Will output: 0, false, apple
将输出： 0, false, apple
回答by alex
Object.keys(AssocArray).map(function(x){return AssocArray[x];}).join(',');
PS: there is Object.valuesmethod somewhere, but it's not a standard. And there are also external libraries like hashish.
PS：Object.values某处有方法，但它不是标准。还有像hashish.
回答by MaxArt
The implementation of functions like Object.map, Object.forEachand so on is still being discussed. For now, you can stick with something like this:
诸如Object.map、Object.forEach等功能的实现仍在讨论中。现在，你可以坚持这样的事情：
function objectJoin(obj, sep) {
var arr = [], p, i = 0;
for (p in obj)
arr[i++] = obj[p];
return arr.join(sep);
}
Edit: using a temporary array and joining it instead of string concatenation for performance improvement.
编辑：使用临时数组并加入它而不是字符串连接以提高性能。
Edit 2: it seems that arr.push(obj[p]);instead of incrementing a counter can actually be fasterin most of recent browsers. See comments.
编辑 2：在大多数最近的浏览器中，似乎arr.push(obj[p]);不是增加计数器实际上可以更快。看评论。
