萌新！js 数组对象去掉相同的

Question

原始数据：(20)[{…},{…},{…},{…},{…},{…},__ob__:Observer]0:dataContent:(...)topic:"年龄"1:dataContent:(...)topic:"性别"2:dataContent:(...)topic:"性别"3:{__ob__:Observer}4:{__ob__:Observer}删除数组对象topic字段相同的，图中有两个topic：性别，只想留住后面的，要删除前面那个topic：性别的，把下标为1的删除留下标为2的期望得到:(20)[{…},{…},{…},{…},{…},{…},__ob__:Observer]0:dataContent:(...)topic:"年龄"2:dataContent:(...)topic:"性别"3:{__ob__:Observer}4:{__ob__:Observer}更新：topic字段值不固定

Answer 1

//传key值和value值数组
function(keys,value){
keys.forEach((k,i)=>{
letindex=arr.findIndex(item=>item[k]==value[i])
arr.splice(index,1)
})
}
                            

Answer 2

functiondemo(list){
letkeys=[],item;
for(leta=list.length-1;a>=0;a--){
item=list[a]
if(keys.some(t=>t===item.topic)){
list.splice(a,1)
}else{
keys.push(item.topic)
}
}
returnlist
}
vararr=[
{
name:'张三',
topic:'班主任'
},
{
name:'李四',
topic:'体育老师'
},
{
name:'王五',
topic:'班主任'
},
{
name:'赵六',
topic:'体育老师'
}
]
varres=demo(arr)
console.log(JSON.stringify(res))//=>[{"name":"王五","topic":"班主任"},{"name":"赵六","topic":"体育老师"}]