[Improvement] optimize area performance (#457)

test/unit/selector.js

@@ -13,7 +13,9 @@ inquirer.prompt([{
   name: 'select',
   message: '请选择要运行的测试文件：',
   choices: files
-}], (result) => {
+}]).then(result => {
   const file = result.select.replace('.spec.js', '');
   shell.exec('karma start test/unit/karma.conf.js --color alway --file ' + file);
+}).catch(error => {
+  console.log(error);
 });

test/unit/specs/area.spec.js

@@ -64,7 +64,7 @@ describe('Area', () => {
       }
     });
 
-    expect(wrapper.vm.areaColumns.length).to.equal(0);
+    expect(wrapper.vm.columns.length).to.equal(0);
   });
 
   it('create an area with columnsNum equal 2', () => {
@@ -75,7 +75,7 @@ describe('Area', () => {
       }
     });
 
-    expect(wrapper.vm.areaColumns.length).to.equal(2);
+    expect(wrapper.vm.columns.length).to.equal(2);
   });
 
   it('create an area with columnsNum equal 1', () => {
@@ -86,7 +86,7 @@ describe('Area', () => {
       }
     });
 
-    expect(wrapper.vm.areaColumns.length).to.equal(1);
+    expect(wrapper.vm.columns.length).to.equal(1);
   });
 
   it('create an area and click cancel', done => {