Question

我有一个对象，我想从中删除元素。

例如：我的对象如下所示

var DecisionObj = '{"Decision":[{"recid":"1183","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"662","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"752","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""}]}';

假设我想删除recid = 662

的行

以下是我试过的代码

var DecisionObj = '{"Decision":[{"recid":"1183","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"662","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"752","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""}]}';
obj = JSON.parse(DecisionObj);
console.log("BEFORE==="+JSON.stringify(obj));
var ddcnt = obj.Decision.length;
var recval = 662;
for (e = 0; e < ddcnt; e++) 
{
     //var DRecVal = obj.Decision[e].recid;
     var DRecVal = obj.Decision[e].recid;
     if(recval == DRecVal)
     { 
       obj.Decision.splice(e,1);
     }
}
console.log("AFTER==="+JSON.stringify(obj));

但上面的代码给出了类似TypeError的错误： obj.Decision [e]在第21行未定义。

我该如何解决这个问题。帮助了！谢谢！

Answer 1

只需添加一个

break;

在循环中调用splice（）之后。

Answer 2

＆＃39;。长度＆＃39;不是零索引。将您的变量修改为以下内容：

var ddcnt = obj.Decision.length - 1;

Answer 3

试试这个

var DecisionObj = '{"Decision":[{"recid":"1183","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"662","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"752","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""}]}';
obj = JSON.parse(DecisionObj);
console.log("BEFORE==="+JSON.stringify(obj));
var ddcnt = obj.Decision.length;
var recval = 662;
for (e = 0; e < ddcnt; e++) 
{
     //var DRecVal = obj.Decision[e].recid;
     var DRecVal = obj.Decision[e].recid;
     if(recval == DRecVal)
     { 
       obj.Decision.splice(e,1);
       break;
     }
}
console.log("AFTER==="+JSON.stringify(obj));

更新：

    function removeID(recid){       
        var DecisionObj = '{"Decision":[{"recid":"1183","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"662","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"752","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""}]}';
        obj = JSON.parse(DecisionObj);
        console.log("BEFORE==="+JSON.stringify(obj));
        var ddcnt = obj.Decision.length;
        for (e = 0; e < ddcnt; e++) {
            var DRecVal = obj.Decision[e].recid;
            if(recid == DRecVal){ 
                obj.Decision.splice(e,1);
            }
        }
        console.log("AFTER==="+JSON.stringify(obj));
    }


removeID(752);

Answer 4

这可以接受recid字符串：

var DecisionObj = '{"Decision":[{"recid":"1183","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"662","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""},{"recid":"752","reason":"Approved but with different Funding Amount","decision":"Approved","approvalamt":"","comment":""}]}';

var DecisionObj = JSON.parse(DecisionObj);


function removeByRecid(arr, recid) {
  for (var elem in arr) {
    if (arr.hasOwnProperty(elem)) {
      if((typeof arr[elem].recid !== 'undefined') && (arr[elem].recid == recid))
      {
        console.log(arr[elem]);
        var index = arr.indexOf(elem);
        arr.splice(index, 1);
      }
    }
  }
}


function removeRecid(obj, recid) {
  for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (Object.prototype.toString.call(obj[key]) === '[object Array]') {
        removeByRecid(obj[key], recid);
      }
    }
  }
}


console.log(DecisionObj);
removeRecid(DecisionObj, "1183");
console.log(DecisionObj);

从json数组迭代和删除

4 个答案: