数组对象去重
let arr=[
{a:1},
{b:2},
{c:3},
{a:1}
]
let arr=[
{a:1,b:2,a:1},
{b:2,a:1,d:4},
{c:3,a:1,e:5},
{a:1,f:6,c:3}
]
var str=arr.reduce((acc,cur)=>(!acc.find(v=>JSON.stringify(v)===JSON.stringify(cur))?[...acc,cur]:acc),[]
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