json驱虫

Question

图示：点每个项都会追加
如何将原始数据变成处理后的 相同的ID取出后来选择的原始数据
[ 
       {"id":4,"answer":"c"},
      {"id":5,"answer":"b"},
      {"id":6,"answer":"b"}, 
     {"id":7,"answer":"c"}, 
      {"id":8,"answer":"b"},
      {"id":7,"answer":"d"},
      {"id":8,"answer":"a"},
      {"id":5,"answer":"c"}
]
处理后 [ {"id":4,"answer":"c"}, {"id":5,"answer":"b"}, {"id":6,"answer":"b"}, {"id":7,"answer":"c"}, {"id":8,"answer":"b"}]

Answer 1

function test(list) {
        let result = [], obj = {}, indexList = ["a", "b", "c", "d"];
        list.forEach(function (item) {
            if (!(obj.hasOwnProperty(item.id) && indexList.indexOf(item.answer) >= indexList.indexOf(obj.id))) {
                obj[item.id] = item.answer;
            }
        });
        for (let item in obj) {
            result.push({
                id: item,
                answer: obj[item]
            });
        }
        return result;
    }

Answer 2

  <div class="weui-cell__ft">
            <input type="radio" class="weui-check" :value="items.score" @change="changeResult(value.id,items.key,items.score)" :name="'radio'+value.id"  >
            <span class="weui-icon-checked"></span>
          </div> 
  function changeResult(id,answer,score1){ 
        var temp1 = {id,answer}; 
        results1.push(temp1); 
       score=score+parseInt(score1);
        jsonStr = JSON.stringify(results1);  
        console.log(jsonStr);
        
      } 
       function test(list) {
        let result = [], obj = {}, indexList = ["a", "b", "c", "d"];
        list.forEach(function (item) {
            if (!(obj.hasOwnProperty(item.id) && indexList.indexOf(item.answer) >= indexList.indexOf(obj.id))) {
                obj[item.id] = item.answer;
            }
        });
        for (let item in obj) {
            result.push({
                id: item,
                answer: obj[item]
            });
        }
        return result;
    }
    function submit() {  
        var zong; 
        var zui;
        var answer;
        var bian;
        var jsonObj =  JSON.parse(jsonStr);//转换为json对象
        jsonObj1=test(jsonObj);
            for(var i=0;i<jsonObj1.length;i++){            bian='"'+jsonObj[i].id+'"'+':'+'"'+jsonObj[i].answer+'"'+',';
              zong=zong+bian; 
              // console.log(zong=zong+bian); 
      }
       zui=zong.slice(0,zong.length-1); 
            // console.log(zui);
      var answer1=zui.replace('undefined','');        answer='{'+answer1+'}';
       console.log(answer);
      console.log(this.score);
     var token=localStorage.getItem('token');
     var xinxi=localStorage.getItem('student');
     var student= eval('('+xinxi+')');
     // console.log(student);
    var teacherid=localStorage.getItem('teacherid');
    var testpaperid=localStorage.getItem('testpaperid');
    var pjid=localStorage.getItem('pjid');
      $.ajax({
                    type: "post",
                    url:"http://127.0.0.1/newtp5/index.php/Xinxi/index/pj2",
                    data: {
                      'token':token,
                      'score':score,
                      'student':xinxi,
                      'answer':answer,
                      'pjid':testpaperid,
                      'teacherid':teacherid,
                      'pjid':pjid,
                    },
                    dataType:'json',                    success: function (data) {
                      alert("评卷成功！将回到登录页");
                      localStorage.clear();
                      setTimeout(function(){
                        window.location="login.html";
                        },2000);
                      
                      
                    }, 
                    fail:function(e){
                        window.alert("提交失败~"); 
                    },
            }) 
  }

Answer 3

我是按你的例子给的算法啊，如果answer还有除a b c d外的枚举值，你要往indexList里加。