JS中数组里面为对象去重的方法

示例：

    let arr1 = [{lat: 22, ing: 114},{lat: 22, ing: 114},{lat: 22, ing: 114}]

    let arr = []

    let obj = {}

    for (let i = 0; i < arr1.length; i ++) {

            if (!obj[arr1[i].lat]) {

                  arr.push(arr1[i])

                 obj[arr1[i].lat] = true

        }

    }

    console.log(arr)