因為急需，在網上又找不到合適的程式碼，所以在很短時間內寫出來的，難免有bug，望見諒。

var arr1 = [{x:513.4261838440111,y:174},
    {x:270.3404255319149,y:174},
    {x:513.4261838440111,y:174},
    {x:520.5167237931058,y:369.80798782499784},
    {x:520.5167237931058,y:369.80798782499784},
    {x:241.57929926401988,y:381.9650668601638},
    {x:270.3404255319149
 
,y:174},
    {x:241.5792992640199,y:381.9650668601638}
]

for (var i = 0; i < arr1.length - 1; i++) {
    for (var j = 1; j < arr1.length; j++) {
        if (i != j) {
            if (arr1[i].x == arr1[j].x && arr1[i].y == arr1[j].y) {
                arr1.splice(j, 1)
            }
        }

    }
}