/**
        * 权限去除重复的
        * 查找删除的
        * 查找新增的
        */
       let getArrDifference = (arr1, arr2) => {
       
           return arr1.concat(arr2).filter(function(v, i, arr) {
       
               return arr.indexOf(v) === arr.lastIndexOf(v);
       
           });
       
       }
       let str1 = [1,2,3];//修改前的权限
       let str2 = [3,4,5];//修改后的权限
       console.log(getArrDifference(str1,str2))
       let newlist = getArrDifference(str1,str2)
       console.log(newlist)
       let dellist = []
       let addlist = []
       for(let i in newlist){
          if(str1.indexOf(newlist[i]) != -1){//删除
              dellist.push(newlist[i])
          }
          if(str2.indexOf(newlist[i]) != -1){//新增
              addlist.push(newlist[i])
          }

       }
           console.log(addlist)
           console.log(dellist)