对象数组根据某个属性去重
let data = [
{id:1,name:'obj'},
{id:3,name:'string'},
{id:2,name:'arr'},
{id:1,name:'num'}
];
let hash = {};
data = data.reduce(function(arr, current) {
hash[current.id] ? '' : hash[current.id] = true && arr.push(current);
return arr
}, []);
console.log(data)