Question

我有这个json结果：

{"Search":[
  {"Title":"Batman Begins","Year":"2005","imdbID":"tt0372784","Type":"movie","Poster":"N/A"},
  {"Title":"Batman v Superman: Dawn of Justice","Year":"2016","imdbID":"tt2975590","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BYThjYzcyYzItNTVjNy00NDk0LTgwMWQtYjMwNmNlNWJhMzMyXkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"},
  {"Title":"Batman","Year":"1989","imdbID":"tt0096895","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTYwNjAyODIyMF5BMl5BanBnXkFtZTYwNDMwMDk2._V1_SX300.jpg"},{"Title":"Batman Returns","Year":"1992","imdbID":"tt0103776","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BODM2OTc0Njg2OF5BMl5BanBnXkFtZTgwMDA4NjQxMTE@._V1_SX300.jpg"},
  {"Title":"Batman Forever","Year":"1995","imdbID":"tt0112462","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BNWY3M2I0YzItNzA1ZS00MzE3LThlYTEtMTg2YjNiOTYzODQ1XkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"},{"Title":"Batman & Robin","Year":"1997","imdbID":"tt0118688","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMGQ5YTM1NmMtYmIxYy00N2VmLWJhZTYtN2EwYTY3MWFhOTczXkEyXkFqcGdeQXVyNTA2NTI0MTY@._V1_SX300.jpg"},
  {"Title":"Batman: The Animated Series","Year":"1992–1995","imdbID":"tt0103359","Type":"series","Poster":"http://ia.media-imdb.com/images/M/MV5BMTU3MjcwNzY3NF5BMl5BanBnXkFtZTYwNzA2MTI5._V1_SX300.jpg"},
  {"Title":"Batman: Under the Red Hood","Year":"2010","imdbID":"tt1569923","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTMwNDEyMjExOF5BMl5BanBnXkFtZTcwMzU4MDU0Mw@@._V1_SX300.jpg"},
  {"Title":"Batman: The Dark Knight Returns, Part 1","Year":"2012","imdbID":"tt2313197","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMzIxMDkxNDM2M15BMl5BanBnXkFtZTcwMDA5ODY1OQ@@._V1_SX300.jpg"},
  {"Title":"Batman: The Dark Knight Returns, Part 2","Year":"2013","imdbID":"tt2166834","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTQ1Mjk1NTY2NV5BMl5BanBnXkFtZTgwMTA2MDEwNzE@._V1_SX300.jpg"}],
  "totalResults":"312",
  "Response":"True"
}

我正在尝试遍历数组并将每个“电影”发布到单独的div块中，我似乎无法从数组中正确检索信息...

我尝试了这段代码，使用javascript alert（）时效果很好......但是一旦我想.text（）我得到的信息TypeError: undefined is not an object...

以下是与警报一起使用的代码，但不适用于.text（）

$.ajax(search_sUrl, {
    complete: function(p_oXHR, p_sStatus){
        oData_search = $.parseJSON(p_oXHR.responseText);

        for(var i = 0; i <= oData_search.totalResults; i++) {
            alert(oData_search["Search"][i].Title);       
        }
    }
});

Answer 1

使用oData_search.Search.length获取数组大小
使用i < oData_search.Search.length代替<=

var oData_search = {
  "Search": [{
    "Title": "Batman Begins",
    "Year": "2005",
    "imdbID": "tt0372784",
    "Type": "movie",
    "Poster": "N/A"
  }, {
    "Title": "Batman v Superman: Dawn of Justice",
    "Year": "2016",
    "imdbID": "tt2975590",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BYThjYzcyYzItNTVjNy00NDk0LTgwMWQtYjMwNmNlNWJhMzMyXkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"
  }, {
    "Title": "Batman",
    "Year": "1989",
    "imdbID": "tt0096895",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BMTYwNjAyODIyMF5BMl5BanBnXkFtZTYwNDMwMDk2._V1_SX300.jpg"
  }, {
    "Title": "Batman Returns",
    "Year": "1992",
    "imdbID": "tt0103776",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BODM2OTc0Njg2OF5BMl5BanBnXkFtZTgwMDA4NjQxMTE@._V1_SX300.jpg"
  }, {
    "Title": "Batman Forever",
    "Year": "1995",
    "imdbID": "tt0112462",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BNWY3M2I0YzItNzA1ZS00MzE3LThlYTEtMTg2YjNiOTYzODQ1XkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"
  }, {
    "Title": "Batman & Robin",
    "Year": "1997",
    "imdbID": "tt0118688",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BMGQ5YTM1NmMtYmIxYy00N2VmLWJhZTYtN2EwYTY3MWFhOTczXkEyXkFqcGdeQXVyNTA2NTI0MTY@._V1_SX300.jpg"
  }, {
    "Title": "Batman: The Animated Series",
    "Year": "1992–1995",
    "imdbID": "tt0103359",
    "Type": "series",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BMTU3MjcwNzY3NF5BMl5BanBnXkFtZTYwNzA2MTI5._V1_SX300.jpg"
  }, {
    "Title": "Batman: Under the Red Hood",
    "Year": "2010",
    "imdbID": "tt1569923",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BMTMwNDEyMjExOF5BMl5BanBnXkFtZTcwMzU4MDU0Mw@@._V1_SX300.jpg"
  }, {
    "Title": "Batman: The Dark Knight Returns, Part 1",
    "Year": "2012",
    "imdbID": "tt2313197",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BMzIxMDkxNDM2M15BMl5BanBnXkFtZTcwMDA5ODY1OQ@@._V1_SX300.jpg"
  }, {
    "Title": "Batman: The Dark Knight Returns, Part 2",
    "Year": "2013",
    "imdbID": "tt2166834",
    "Type": "movie",
    "Poster": "http://ia.media-imdb.com/images/M/MV5BMTQ1Mjk1NTY2NV5BMl5BanBnXkFtZTgwMTA2MDEwNzE@._V1_SX300.jpg"
  }],
  "totalResults": "312",
  "Response": "True"
}

for (var i = 0; i < oData_search.Search.length; i++) {
  var movie = oData_search.Search[i];
  $('#results').append('<div>' + movie.Title + ' - ' + movie.Year + '</div>')
}

#results div {
  background: #ddd;
  padding: 4px;
  margin-bottom: 10px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="results"></div>

Answer 2

那是因为你的循环运行了312次，但你的对象只包含几个项目。当您的循环超过项目的实际长度时，oData_search["Search"][i]将为undefined，因此错误“undefined不是对象”。

检查数组长度。

for(var i = 0; i < oData_search.Search.length; i++)

Answer 3

试试这个：

 for(var i = 0; i < oData_search["Search"].length; i++) {
            var title = oData_search["Search"][i].Title    
   }

totalResults的值为312，但oData_search["Search"]中的元素为8。

Answer 4

因为 oData_search.Search 是一个数组而不是经典的for循环，所以你可以使用Array.prototype.forEach()。通过这种方式，您可以避免获得数组本身不可用的元素：

一个小例子：

＆＃13;

CREATE TABLE Customers
(CustomerID int Identity (1,1) NOT NULL PRIMARY KEY,
customerName varchar (50),
Address varchar (255),
Phone int NOT NULL,
Email varchar(50),
Gender varchar(50),
Age int, 
);

＆＃13;

var str = '{"Search":[\
{"Title":"Batman Begins","Year":"2005","imdbID":"tt0372784","Type":"movie","Poster":"N/A"},\
{"Title":"Batman v Superman: Dawn of Justice","Year":"2016","imdbID":"tt2975590","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BYThjYzcyYzItNTVjNy00NDk0LTgwMWQtYjMwNmNlNWJhMzMyXkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"},\
{"Title":"Batman","Year":"1989","imdbID":"tt0096895","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTYwNjAyODIyMF5BMl5BanBnXkFtZTYwNDMwMDk2._V1_SX300.jpg"},{"Title":"Batman Returns","Year":"1992","imdbID":"tt0103776","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BODM2OTc0Njg2OF5BMl5BanBnXkFtZTgwMDA4NjQxMTE@._V1_SX300.jpg"},\
{"Title":"Batman Forever","Year":"1995","imdbID":"tt0112462","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BNWY3M2I0YzItNzA1ZS00MzE3LThlYTEtMTg2YjNiOTYzODQ1XkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"},{"Title":"Batman & Robin","Year":"1997","imdbID":"tt0118688","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMGQ5YTM1NmMtYmIxYy00N2VmLWJhZTYtN2EwYTY3MWFhOTczXkEyXkFqcGdeQXVyNTA2NTI0MTY@._V1_SX300.jpg"},\
{"Title":"Batman: The Animated Series","Year":"1992–1995","imdbID":"tt0103359","Type":"series","Poster":"http://ia.media-imdb.com/images/M/MV5BMTU3MjcwNzY3NF5BMl5BanBnXkFtZTYwNzA2MTI5._V1_SX300.jpg"},\
{"Title":"Batman: Under the Red Hood","Year":"2010","imdbID":"tt1569923","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTMwNDEyMjExOF5BMl5BanBnXkFtZTcwMzU4MDU0Mw@@._V1_SX300.jpg"},\
{"Title":"Batman: The Dark Knight Returns, Part 1","Year":"2012","imdbID":"tt2313197","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMzIxMDkxNDM2M15BMl5BanBnXkFtZTcwMDA5ODY1OQ@@._V1_SX300.jpg"},\
{"Title":"Batman: The Dark Knight Returns, Part 2","Year":"2013","imdbID":"tt2166834","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTQ1Mjk1NTY2NV5BMl5BanBnXkFtZTgwMTA2MDEwNzE@._V1_SX300.jpg"}],\
"totalResults":"312",\
"Response":"True"\
}';

oData_search = $.parseJSON(str);
oData_search.Search.forEach(function(ele, idx) {
  console.log(ele.Title);
});

＆＃13;

Answer 5

＆＃13;

oData_search = {"Search":[
  {"Title":"Batman Begins","Year":"2005","imdbID":"tt0372784","Type":"movie","Poster":"N/A"},
  {"Title":"Batman v Superman: Dawn of Justice","Year":"2016","imdbID":"tt2975590","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BYThjYzcyYzItNTVjNy00NDk0LTgwMWQtYjMwNmNlNWJhMzMyXkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"},
  {"Title":"Batman","Year":"1989","imdbID":"tt0096895","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTYwNjAyODIyMF5BMl5BanBnXkFtZTYwNDMwMDk2._V1_SX300.jpg"},{"Title":"Batman Returns","Year":"1992","imdbID":"tt0103776","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BODM2OTc0Njg2OF5BMl5BanBnXkFtZTgwMDA4NjQxMTE@._V1_SX300.jpg"},
  {"Title":"Batman Forever","Year":"1995","imdbID":"tt0112462","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BNWY3M2I0YzItNzA1ZS00MzE3LThlYTEtMTg2YjNiOTYzODQ1XkEyXkFqcGdeQXVyMTQxNzMzNDI@._V1_SX300.jpg"},{"Title":"Batman & Robin","Year":"1997","imdbID":"tt0118688","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMGQ5YTM1NmMtYmIxYy00N2VmLWJhZTYtN2EwYTY3MWFhOTczXkEyXkFqcGdeQXVyNTA2NTI0MTY@._V1_SX300.jpg"},
  {"Title":"Batman: The Animated Series","Year":"1992–1995","imdbID":"tt0103359","Type":"series","Poster":"http://ia.media-imdb.com/images/M/MV5BMTU3MjcwNzY3NF5BMl5BanBnXkFtZTYwNzA2MTI5._V1_SX300.jpg"},
  {"Title":"Batman: Under the Red Hood","Year":"2010","imdbID":"tt1569923","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTMwNDEyMjExOF5BMl5BanBnXkFtZTcwMzU4MDU0Mw@@._V1_SX300.jpg"},
  {"Title":"Batman: The Dark Knight Returns, Part 1","Year":"2012","imdbID":"tt2313197","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMzIxMDkxNDM2M15BMl5BanBnXkFtZTcwMDA5ODY1OQ@@._V1_SX300.jpg"},
  {"Title":"Batman: The Dark Knight Returns, Part 2","Year":"2013","imdbID":"tt2166834","Type":"movie","Poster":"http://ia.media-imdb.com/images/M/MV5BMTQ1Mjk1NTY2NV5BMl5BanBnXkFtZTgwMTA2MDEwNzE@._V1_SX300.jpg"}],
  "totalResults":"312",
  "Response":"True"
}
oData_search.Search.forEach(function(value, key){
  console.log(value.Title);
});

＆＃13;

forEach()

oData_search.Search.forEach(function(value, key){
   console.log(value.Title);
});

json循环遍历嵌套数组

5 个答案: