select二级联动js部分

    js部分
    data（）{
     return{
     // 购买类型
			 departments: [
			            {name: 'T1', majors: ['1台', '2台', '3台','4台']},
			           {name: 'T2', majors: ['1台', '2台', '3台','4台']},
			          ],
			          selectedDepartment: '',
					  selectedDepartmajors:'',
     }}
    computed: {
	        majors: function() {
	          var majors = [], 
			  selectedDepart = this.$data.selectedDepartment;
	          this.$data.departments.forEach(function(d) {
	            if(d.name == selectedDepart)
	              majors = d.majors;
	          });
	          return majors;
	        }
	        }