javascript - 在数组的开头添加键值

Question

我想在 javascript JSON 数组的开头添加一个键->值对，如下所示:

var temp = new Array();
temp = {
          ['LABEL_ID': 10, 'LABEL_TYPE': A3],
          ['LABEL_ID': 17, 'LABEL_TYPE': A6]
       }

我想做什么:

var temp = new Array();
temp = {
          'PAPER': A80 
               ['LABEL_ID': 10, 'LABEL_TYPE': A3],
               ['LABEL_ID': 17, 'LABEL_TYPE': A6]
       }

你能帮帮我吗？

编辑这是我的代码:

// returns paper type from selected grid line
var ppt     = Ext.getCmp('labelType').getValue();

// returns selected grid rows
var rows    = Ext.getCmp('labelGrids').getSelectionModel().getSelection();


// here is my array that I want to add ppt variable value to existing array, then I will convert this to a JSON array
for (var i = 0; i < count; i++)
{
   prints[i] = {'LABEL_ID': rows[i].data.LABEL_ID, 'LABEL_TYPE':rows[i].data.LABEL_TYPE}
}

原因是在数组的开头添加ppt值，我只需要在服务器端记录这条记录。因此，我不想在所有行中重复!

Answer 1

好吧，我希望你在问题中指的是这个脚本:

要回答您编辑过的问题，一种简单的方法是将其包装在另一个对象中:

var temp = new Array();
temp = [
  {"LABEL_ID": 10, "LABEL_TYPE": "A3"},
  {"LABEL_ID": 17, "LABEL_TYPE": "A6"}
       ]
 // wrap temp in another object;

 var obj = {};
 obj.PAPER = A80;
 obj.Data = temp;
 //And convert to json.
 console.log(JSON.stingify(obj));

输出:

{"PAPER":"A80","Data":[{"LABEL_ID":10,"LABEL_TYPE":"A3"},{"LABEL_ID":17,"LABEL_TYPE":"A6"}]}

希望这对您有所帮助。调用该函数将为您的对象添加所需的属性

var temp = new Array();
temp = [
  {"LABEL_ID": 10, "LABEL_TYPE": "A3"},
  {"LABEL_ID": 17, "LABEL_TYPE": "A6"}
       ]

  addPaperProperty(temp, 'PAPER', ['AA','BB']);

  function addPaperProperty(currentArray, newPropertyField, newPropertyArr){
    var newArray = [];
    var i=0;
    $(temp).each(function(){
       this[newPropertyField] = newPropertyArr[i++];
      newArray.push(this);
    });
    console.log(newArray);
    return newArray;
  }

结果会是

[{LABEL_ID: 10, LABEL_TYPE: "A3", PAPER: "AA"},
{LABEL_ID: 17, LABEL_TYPE: "A6", PAPER: "BB"}]