Question

我已在js（developer.js）文件中编写此代码。

app.filter('reverse', function() {
  return function(items) {
  return items.slice().reverse();
  };
});

现在，这个代码我放了因为我需要反转ng-repeat结果，所以我创建了手动过滤器。

但是这段代码工作正常，但在控制台中显示错误。

我不想看到我的控制台出现所有错误。

错误：

TypeError: Cannot call method 'slice' of undefined
    at Object.<anonymous> (http://192.168.0.14/test/js/developer.js:35:24)
    at e (https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:69:187)
    at Ia.| (https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:129:335)
    at https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:68:341
    at Ia.| (https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:129:340)
    at https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:68:341
    at Object.e.$eval (https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:88:347)
    at Object.<anonymous> (https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:147:244)
    at Object.e.$digest (https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:86:286)
    at Object.e.$apply (https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js:88:506)

P.S。
如果项目内总共有6个值，则此错误将首先显示4次。
项目有对象数组。

当我尝试控制过滤器中的项目时，前4次显示“未定义”，然后显示最后两次，显示

[Object, Object, Object, Object, Object, Object]

在该对象内部，定义了值

项目持有这个对象数组[数据以json形式出现]。

{
id: "51c2824088358f0d39000000",
name: "clientdemo",
key: ***,
secret: ***,
description: "It is good.",
icon_url: "/oauth2/static/media/images/icon/default.png"
},
{
id: "51c2cca588358f35aa000003",
name: "grantallllla",
key: ***,
secret: ***,
description: "This asdf",
icon_url: "/oauth2/static/media/images/icon/default.png"
},
{
id: "51d14e8c88358f6e96000024",
name: "12341234",
key: ***,
secret: ***,
description: "Enter descript12341234ion here",
icon_url: "/oauth2/static/media/images/icon/default.png"
},
{
id: "51d14e9888358f6e96000026",
name: "sdfgds345",
key: ***,
secret: ***,
description: "dsfasdfasdfasdf",
icon_url: "/oauth2/static/media/images/icon/default.png"
},
{
id: "51d1758888358f5171000002",
name: "1321",
key: ***,
secret: ***,
description: "zxcvzxcvcxvbxcvb",
icon_url: "/oauth2/static/media/images/icon/51c2819e88358f0d2a000000_1372701408_RhLW.jpg"
},
{
id: "51d3d8c588358f461a000002",
name: "sdafasdf",
key: ***,
secret: ***,
description: "asdfasdf",
icon_url: "/oauth2/static/media/images/icon/51c2819e88358f0d2a000000_1372857885_PSzB.jpg"
}

Answer 1

您是否尝试过处理实际错误？

也许只是尝试一下？

app.filter('reverse', function() {
  return function(items) {
    if( !items ){ return; } // This will take care of the error
    return items.slice().reverse();
  };
});

您可能还想知道为什么您的某些数据未定义，可能存在您可能需要处理的问题。

为什么slice（）显示错误但代码运行完美？

1 个答案: