js数组中去重对象

var allCourses = new Array();
var coursesId = new Array();
function findCourses() {
    Courses.data().each(function (value, index) {
        if (CoursesId.indexOf(value.id) == -1) {
            coursesId.push(value.id)
            allcourses.push(value);
        }
    });
}