js 删除数组中重复的对象

有这样一个数组[{permissionId:1},{permissionId:1},{permissionId:2},{permissionId:3}]
需要删除数组中重复的对象代码如下

   var newArr=[]
    for ( var j = 0; j < response.data.length; j++ ) {
            if(newArr.indexOf(response.data[j].permissionId) === -1){
               newArr.push(response.data[j].permissionId)
            }    
        }