对类型是单层结构对象的数组进行去重，有以下方法可以实现：
let arr = [
{
name: 'test01',
age: '18',
weight: '65kg'
},
{
name: 'test02',
age: '19',
weight: '70kg'
},
{
name: 'test02',
age: '19',
weight: '70kg'
}
]
返回结果为：arr=[ {
name: 'test01',
age: '18',
weight: '65kg'
},
{
name: 'test02',
age: '19',
weight: '70kg'
}]
