数组对象 去重 (id,name)

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let a=[{id:1,value:'this'},{id:1,value:'is'},{id:1,value:'is'}] let set=[...new Set(a.map(item=>item.id))] a=a.filter((item,index)=>item.id===set[index])     let ids = fileList.map((value) => value.name);       let idsSet = new Set(ids);       if (idsSet.size !== ids.length) {         this.$message.warning("附件重名,请修改文件名后重新上传");         let obj = {};         //利用obj 属性不能重复         fileList = fileList.reduce((cur, next) => {           obj[next.name] ? "" : (obj[next.name] = true && cur.push(next));           return cur;         }, []);       }

 

　　

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let a=[{id:1,value:'this1'},{id:2,value:'is1'},{id:1,value:'is222'},{id:2,value:'is222'}] //let set=[...new Set(a.map(item=>item.id))] //console.log(a.filter((item,index)=>item.id===set[index]));     //后重复的会覆盖之前的 function uniq(arr,key){     return Object.values(arr.reduce((ret,e)=>{         ret[e[key]]=e         return ret     },{})) }     function uniqForObject(arr){     let map=new Map()     for(let item of arr){         if(!map.has(item.id)){             map.set(item.id,item)         }     }     return [...map.values()]   }