php - $.getJSON 似乎返回为带有嵌套对象的文字字符串

Question

您好，我是 JSON 新手，遇到了一些问题。

我正在使用 jquery 的 $.getJSON 方法请求一些信息，如下所示：

function getPlayerPositions(type) { //left/top/move
    var loadUrl = "../php/client_communication/relay_positions.php";
    var playerPos = [];

    $.ajaxSetup ({
        cache: false,
        async: false
    });

    $.getJSON( loadUrl, { type: type } )
    .done(function( data ) {
            useReturnData(data);
    })
    .fail(function( jqxhr, textStatus, error ) {
      var err = textStatus + ', ' + error;
      console.log( "Request Failed: " + err);
    });

    function useReturnData(data){
        playerPos = data;
        alert("response: "+playerPos);
    };

    //reset to asynchronous ajax from now on
    $.ajaxSetup ({
        async: true
    });
    alert(playerPos[0]);
    return playerPos;
}

当我的函数之前运行时，我会收到正确的 JSON 编码数据，然后我可以通过我的“playerPos”数组访问这些数据。（即警报（playerPos[4]））

但是这次我接收到包含多个嵌套对象的数据：

这是警告的 ajax 响应：

响应：[{"位置":"LB","ID":"2","x-offset":"0","y-offset":"0","Stats":{"ID":" 2","IMG":"/images/player_avatars/player_test.png","First_Name":"Daniel","Surname":"Vernall","昵称":"Tall Tree","number":"25" ,"Fav_Pos_1":"LB","Fav_Pos_2":"CB","team":"A","SPEED":"100","AGILITY":"100","STRENGTH":"100","跳跃":"100","标记":"100","耐力":"100","领导力":"100","适应性":"100","约束":"100","INJURY_PRONE":"100","HEAL_TIME":"100","MORALE":"100","AGGRESSIVENESS":"100","PASSING":"100","SHOOTING_ACCURACY":"100","SHOOTING_POWER ":"100","HEADING":"100","MISC_BODY":"100","POSITIONING":"100","FIRST_TOUCH":"100","LONG_DISTANCE":"100","STRONG_FOOT": "0","CONTROL":"100","CURLING":"100","CHIPPING":"100","VOLLEYING":"100","SET_PIECES":"100","THROW_INS":"100 ","REFLEXES":"100","ONE_ON_ONES":"100","AERIAL_ABILITY":"100","捕捉":"100","协调":"100","投掷":"100","coordX":0,"coordY":0,"yellowCards":0,"redCards":0,"shotsOnTarget ":0,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses":0,"tackles":0,"timesTackled":0,"intercepts": 0,"intercepted":0,"badReceive":0}},{"Position":"LCB","ID":"3","x-offset":"0","y-offset":" 0","Stats":{"ID":"3","IMG":"/images/player_avatars/player_test.png","First_Name":"Teddy","Surname":"Vernall","昵称" :"熊","数字":"11","Fav_Pos_1":"ST","Fav_Pos_2":"CAM","team":"A","SPEED":"100","AGILITY":"100" “力量”：“100”，“跳跃”：“100”，“标记”：“100”，“耐力”：“100”，“领导力”：“100”，“适应性”：“100”，休息...,"SET_PIECES":"100","THROW_INS":"100","REFLEXES":"100","ONE_ON_ONES":"100","AERIAL_ABILITY":"100","CATCHING":" 100","协调":"100","投掷":"100","coordX":0,"coordY":0,"yellowCards":0,"redCards":0,"shotsOnTarget":0,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses":0,"tackles":0,"timesTackled":0,"intercepts ":0,"intercepted":0,"badReceive":0}},{"Position":"GK","ID":"12","x-offset":"0","y-offset" :"0","Stats":{"ID":"12","IMG":"/images/player_avatars/player_test.png","First_Name":"Rumple","Surname":"Stiltskin"," Nickname":"Rumpy Pump Stink","number":"29","Fav_Pos_1":"CDM","Fav_Pos_2":"LB","team":"A","SPEED":"100","敏捷度：“100”，“力量”：“100”，“跳跃”：“100”，“标记”：“100”，“耐力”：“100”，“领导力”：“100”，“适应性” :"100","RESTRAINT":"100","INJURY_PRONE":"100","HEAL_TIME":"100","士气":"100","AGGRESSIVENESS":"100","PASSING":" 100","SHOOTING_ACCURACY":"100","SHOOTING_POWER":"100","HEADING":"100","MISC_BODY":"100","POSITIONING":"100","FIRST_TOUCH":"100" ,"LONG_DISTANCE":"100","STRONG_FOOT":"50","CONTROL":"100","CURLING":"100","CHIPPING":"100","VOLLEYING":"100","SET_PIECES":"100","THROW_INS":"100","REFLEXES":"100","ONE_ON_ONES" :"100","AERIAL_ABILITY":"100","CATCHING":"100","COORDINATION":"100","THROWING":"100","coordX":0,"coordY":0," YellowCards":0,"redCards":0,"shotsOnTarget":0,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses":0,"tackles" :0,"timesTackled":0,"intercepts":0,"intercepted":0,"badReceive":0}}]VOLLEYING":"100","SET_PIECES":"100","THROW_INS":"100","REFLEXES":"100","ONE_ON_ONES":"100","AERIAL_ABILITY":"100","CATCHING" :"100","协调":"100","投掷":"100","coordX":0,"coordY":0,"yellowCards":0,"redCards":0,"shotsOnTarget":0 ,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses":0,"tackles":0,"timesTackled":0,"intercepts":0,"截获":0,"badReceive":0}}]VOLLEYING":"100","SET_PIECES":"100","THROW_INS":"100","REFLEXES":"100","ONE_ON_ONES":"100","AERIAL_ABILITY":"100","CATCHING" :"100","协调":"100","投掷":"100","coordX":0,"coordY":0,"yellowCards":0,"redCards":0,"shotsOnTarget":0 ,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses":0,"tackles":0,"timesTackled":0,"intercepts":0,"截获":0,"badReceive":0}}]100","ONE_ON_ONES":"100","AERIAL_ABILITY":"100","CATCHING":"100","COORDINATION":"100","THROWING":"100","coordX":0," coordY":0,"yellowCards":0,"redCards":0,"shotsOnTarget":0,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses" :0,"tackles":0,"timesTackled":0,"intercepts":0,"intercepted":0,"badReceive":0}}]100","ONE_ON_ONES":"100","AERIAL_ABILITY":"100","CATCHING":"100","COORDINATION":"100","THROWING":"100","coordX":0," coordY":0,"yellowCards":0,"redCards":0,"shotsOnTarget":0,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses" :0,"tackles":0,"timesTackled":0,"intercepts":0,"intercepted":0,"badReceive":0}}]"redCards":0,"shotsOnTarget":0,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses":0,"tackles":0,"timesTackled ":0,"intercepts":0,"intercepted":0,"badReceive":0}}]"redCards":0,"shotsOnTarget":0,"shotsOffTarget":0,"goals":0,"assists":0,"completedPasses":0,"incompletePasses":0,"tackles":0,"timesTackled ":0,"intercepts":0,"intercepted":0,"badReceive":0}}]

Javascript 似乎不将这些视为单独的对象：

例如，当提醒 playerPos[4] 时，它只会提醒上面字符串中的第 4 个字符。

我意识到上面的内容很难阅读，但我想向您展示警报的实际副本。

这是它访问的 php 文件中的一点：

if($type=="db_request"){
    $team = new Team;
    $team = $team->buildTeam(101, 'A');
    ChromePhp::log($team);

    $response = json_encode($team);
}

我上面的日志如下所示：

因此您可以看到 php 文件将“$team”视为包含多个嵌套对象

有任何想法吗？

Answer 1

似乎您正在对对象进行双重编码（使用类似的东西echo json_encode($response);）。然后，jQuery 会将 JSON 编码的字符串解析为 JSON 编码的对象字符串……</p>

您可以通过在浏览器的网络检查器（Chrome devtools、Opera Dragonfly、Firebug）中检查有效的 HTTP 响应来检查此类服务器端故障。

Answer 2

"Stats":{
"ID":"3",
"IMG":"/images/player_avatars/player_test.png",
"First_Name":"Teddy",
"Surname":"Vernall",
"Nickname":"Bear",
"number":"11",
"Fav_Pos_1":"ST",
"Fav_Pos_2":"CAM",
"team":"A",
"SPEED":"100",
"AGILITY":"100",
"STRENGTH":"100",
"JUMP":"100",
"MARKING":"100",
"STAMINA":"100",
"LEADERSHIP":"100",
"ADAPTABILITY":"100",
"REST...,"SET_PIECES":"100",
"THROW_INS":"100",
"REFLEXES":"100",
"ONE_ON_ONES":"100",
"AERIAL_ABILITY":"100",
"CATCHING":"100",
"COORDINATION":"100",
"THROWING":"100",
"coordX":0,
"coordY":0,
"yellowCards":0,
"redCards":0,
"shotsOnTarget":0,
"shotsOffTarget":0,
"goals":0,
"assists":0,
"completedPasses":0,
"incompletePasses":0,
"tackles":0,
"timesTackled":0,
"intercepts":0,
"intercepted":0,
"badReceive":0
}

见SyntaxError: Unexpected token S

你SET_PIECES已经打破了json使其无效。

Answer 3

我知道这已经得到解答，但我注意到一些性能提示可能有助于安静一点。尽可能避免嵌套函数确实有助于加快应用程序的速度。

function getPlayerPositions(type) { //left/top/move
var loadUrl = "../php/client_communication/relay_positions.php";
var playerPos = [];

$.ajax( loadUrl, { type: type, async: false, cache: false, dataType: "json"  } )
    .done(function( data ) {
        playerPos = data;
        alert("response: "+playerPos);
    })
 .fail(function( jqxhr, textStatus, error ) {
      var err = textStatus + ', ' + error;
      console.log( "Request Failed: " + err);
   });

    alert(playerPos[0]);
    return playerPos;
}

更多信息在这里