How to loop post vue Javascript

I want to send some data at once, but when sending with loop it gets 500 duplicate id status, maybe when I click JavaScript sends data at once

assignment: function (event) {

            for (var i = 0; i < this.perPage; i++){
            this.$http.post('mass_assigment', {
                id_target: 5,
                id_cms_users: 4,
                updated_by: 5,
            })
                .then(function (response) {
                    console.log(response);
                })
                .catch(function (error) {
                    console.log(error);
                });
            }
        alert('sukses')
        if (event){
            alert(event.target.tagName)
        }
    }

via Chebli Mohamed