How to implement deduplication of array attributes and verify duplicate data in js

New task: drop-down box to remove duplicate data

//Remove the front-end object array according to a certain attribute

The jsonArray is the one you want to duplicate array of objects.

Recommended tutorial: js tutorial

In the example, duplicates are removed according to the name attribute, as follows:

//前端对象数组 按某个属性去重
     var obj = {};
    jsonArray = jsonArray.reduce(function(item,next){
      obj[next.name]?'':obj[next.name] = true&&item.push(next);
      return item;
    },[]);       
    for(var i= 0;i<jsonArray.length;i++){
        console.log(jsonArray[i])
    }

Verify whether a certain attribute in the object array exists Repeat

Check the double if loop in the array object array to check whether the identityid2 attribute is repeated

if(json[i][key].length>0){
                var array = json[i][key];
                 for(var x =0 ;x<array.length;x++){
                    for(var y =0;y<array.length;y++){
                      if(array[x].identityid2 == array[y].identityid2 && x!=y){
                        sweetAlert("","待签结算合同"+ i +"中的未中标供应商的第" + (x+1) +"包的身份证号" + array[x].identityid2 + "被复用", "error");
                        return false;
                      }
                    }                                      
                 }
               }

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