var arr=[
{"id":"1","title":"aaa"},
{"id":"2","title":"bbb"},
]
var obj={"id":"2","title":"bbb"};
if(JSON.stringify(arr).indexOf(JSON.stringify(obj)) === -1){
arr.push(obj)
}else{
arr.map((item,i)=>{
if(item.id==obj.id){
arr.splice(i,1);
}
})
}
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