数组的reduce()方法(ie9以下不支持此方法)

arrobj=[
  {id='1',name='皓皓'},
  {id='2',name='红红'},
  {id='3',name='馨馨'},
  {id='1',name='媛媛'},
  {id='2',name='芳芳'}
]

let newobj = {}; 
arr = arr .reduce((preVal, curVal) => {
    newobj[curVal.id] ? '' : newobj[curVal.id] = preVal.push(curVal); 
        //根据什么去重就写什么   例如根据名字就是 curVal.name
    return preVal 
}, [])

//最终结果
[
  {id='1',name='皓皓'},
  {id='2',name='红红'},
  {id='3',name='馨馨'},
]