javascript - 在 javascript 中迭代 json 哈希

Question

Json:

{
 "comments":[
    {"id":1,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/1.json"},
    {"id":2,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/2.json"},{"id":3,"author_name":"Yerassyl","comment_text":"Hello world!","url":"http://localhost:3000/comments/3.json"},
    {"id":4,"author_name":"Yerassyl","comment_text":"hi there","url":"http://localhost:3000/comments/4.json"}
 ]
}

如何迭代评论中的每条评论。我想要这样的东西:

//pseudocode
comments.each(key,value){
// do something
}

我尝试了map，但map是用于数组的。

编辑:如果我删除根节点“评论”，我可以使用.map:

var commentNodes = this.props.comments.map(function(comment,index){
      });

忽略this.props，它实际上是React.js。
console.log(this.props.comments) 返回带有根节点“comments”的 json 对象

Answer 1

假设你有

var obj = {
 "comments":[
    {"id":1,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/1.json"},
    {"id":2,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/2.json"},{"id":3,"author_name":"Yerassyl","comment_text":"Hello world!","url":"http://localhost:3000/comments/3.json"},
    {"id":4,"author_name":"Yerassyl","comment_text":"hi there","url":"http://localhost:3000/comments/4.json"}
 ]
};

例如，您可以这样做

obj.comments.map(function (comment) {
    console.log(comment);
});