在javascript中解析为未定义的JSON值

Question

我试图在Javascript中解析JSON.JSON创建为ajax响应:

$.ajax(url, {
  dataType: "text",
  success: function(rawData, status, xhr) {
    var data;
    try {
      data = $.parseJSON(rawData);
      var counter = data.counter;
      for(var i=1; i<=counter; i++){
        //since the number of 'testPath' elements in the JSON depend on the 'counter' variable, I am parsing it in this way
        //counter has the correct integer value and loops runs fine
        var currCounter = 'testPath'+i ;
        alert(data.currCounter); // everything alerts as undefined
      }
    } catch(err) {
      alert(err);
    }
  },
  error: function(xhr, status, err) {
    alert(err);
  }
});

但是所有值都警告'undefined'作为值(除了'counter',它给出了正确的值)在firebug中看到的实际字符串如下:

{"testPath1":"ab/csd/sasa", "testPath2":"asa/fdfd/ghfgfg", "testPath3":"ssdsd/sdsd/sds", "counter":3}

Answer 1

alert(data[currCounter]) ,这会奏效.

为data.currCounter查找关键"currCounter`的对象,而不是通过currCounter的价值.

例:

http://jsfiddle.net/bJeWm/1/

var myObj = { 'name':'dhruv','age':28 };
var theKey = 'age';
alert(myObj.theKey);  // undefined
alert(myObj[theKey]); // 28