迭代对象数组

我有一个像这样的JSON字符串

var json = '{ "Comments": [ { "Id" : 1,"Comment" : "Test comment","Name" : "Yogesh","Child" : 0}, { "Id" : 2,"Comment" : "Test comment II","Name" : "Yogesh","Child" : 0} ] }'; 

而我正试图迭代这些对象：

 var parsedJSON = $.parseJSON(json); var html = ""; for (comment in parsedJSON.Comments) { html += "Id: " + comment.Id; html += "Comment: " + comment.Comment; html += "Name: " + comment.Name; html += "Child: " + comment.Child; html += "
"; } 

但是这里for循环的comment只变为0和1 ，我的意思不是一个对象而只是一个字符串，我怎么能迭代这个数组呢？

Answer 1

 var json = '{ "Comments": [{ "Id" : 1,"Comment" : "Test comment","Name" : "Yogesh","Child" : 0},{ "Id" : 2,"Comment" : "Test comment II","Name" : "Yogesh","Child" : 0}] }'; var parsedJSON = $.parseJSON(json), // jsonData should json html = "", comments =parsedJSON.Comments; // keeping reference of parsedJSON and its an Array // Here key will give 0, 1 etc ie. index of array for (var key in comments) { html += "Id: " + comments[key].Id; html += "Comment: " + comments[key].Comment; html += "Name: " + comments[key].Name; html += "Child: " + comments[key].Child; html += "
"; } 

演示

Answer 2

你似乎误解了for..in循环是如何工作的。 comment将迭代地成为数组的键。 在任何情况下，你不应该在数组上使用for..in ，只能使用对象 – 即使这样也要谨慎。

 var l = parsedJSON.Comments.length, i, comment; for( i=0; i 

Answer 3

你可以尝试这个：

  var JsonData = { "Comments": [ { "Id" : 1,"Comment" : "Test comment","Name" : "Yogesh","Child" : 0}, { "Id" : 2,"Comment" : "Test comment II","Name" : "Yogesh","Child" : 0} ] }; var html = ""; for (var i = 0; i < JsonData.Comments.length; i++) { comment = JsonData.Comments[i]; html += "Id: " + comment.Id; html += " Comment: " + comment.Comment; html += " Name: " + comment.Name; html += " Child: " + comment.Child; html += "
"; } alert(html); 

Answer 4

你可以使用$.each ：

 var html = ""; $.each(parsedJSON.Comments, function(i, comment) { html += "Id: " + comment.Id; html += "Comment: " + comment.Comment; html += "Name: " + comment.Name; html += "Child: " + comment.Child; html += "
"; } 

或者，您可以使用$.map ：

 var html = $.map(parsedJSON.Comments, function(comment, i) { return "Id: " + comment.Id + "Comment: " + comment.Comment + "Name: " + comment.Name + "Child: " + comment.Child + "
"; }).join(''); 

Answer 5

注释包含一个包含两个元素的数组。

 { "Comments" : [ { 1 }, { 2 }] ... 

所以你可以用它来访问它

 for (var i = 0, len = parsedJSON.Comments.length; i < len; i++) { html += "Id: " + parsedJSON.Comments[i].Id; html += "Comment: " + parsedJSON.Comments[i].Comment; html += "Name: " + parsedJSON.Comments[i].Name; html += "Child: " + parsedJSON.Comments[i].Child; html += "
"; }