bug fixes

src/pages/project/components/course.vue

@@ -54,7 +54,7 @@ export default {
           { type: 'input', placeholder: '请输入课程ID/课程名称', prop: 'key' }
         ],
         columns: [
-          { type: 'selection', minWidth: '50px', fixed: 'left', visible: this.hasDelete },
+          { type: 'selection', minWidth: '50px', fixed: 'left', visible: this.hasSave },
           { prop: 'id', label: '课程ID', minWidth: '120px', fixed: 'left' },
           { prop: 'chinese_name', label: '课程名称', minWidth: '130px' },
           { prop: 'english_name', label: '课程名称（英）', minWidth: '160px' },

src/pages/project/components/student.vue

@@ -57,7 +57,7 @@ export default {
           { type: 'input', placeholder: '请输入邮箱地址', prop: 'email' }
         ],
         columns: [
-          { type: 'selection', minWidth: '50px', fixed: 'left', visible: this.hasDelete },
+          { type: 'selection', minWidth: '50px', fixed: 'left', visible: this.hasSave },
           { prop: 'id', label: '学员ID', minWidth: '120px', fixed: 'left' },
           { prop: 'chinese_name', label: '姓名', minWidth: '90px' },
           {