Property or method "activeNames" is not defined on the instance but referenced during render. Make sure that this property

这个错误通常出现在 Vue.js 组件中，因为你在模板中引用了一个不存在的属性或方法。你需要检查你的组件代码，看看是否有一个名为 "activeNames" 的属性或方法，如果没有，你需要添加它。如果有，你需要确保你正确地引用了它，比如在 data 中定义或在 methods 中定义。另外，还需要注意一下组件中的命名规范，以免出现类似大小写不一致等问题导致的错误。

相关问题

Property or method "handleFlowRecord" is not defined on the instance but referenced during render. Make sure that this property is

defined in the component and referenced in the template.

This error message usually occurs when you are trying to render a component that uses a method or property that is not defined in the component. In your case, the error message suggests that the "handleFlowRecord" method is not defined in the component, but it is being referenced in the template.

To fix this error, you need to define the "handleFlowRecord" method in the component. You can do this by adding a method with this name to the component's methods object. For example:

export default {
  name: 'MyComponent',
  methods: {
    handleFlowRecord() {
      // add your method code here
    }
  }
}

Once you have defined the method, make sure that you are referencing it correctly in the template. You should use the v-on directive to bind the method to an event. For example:

<button v-on:click="handleFlowRecord">Click me</button>

This will call the "handleFlowRecord" method when the button is clicked.

Property or method "index" is not defined on the instance but referenced during render. Make sure that this property is reactive

This error usually occurs when you are referencing a property or method in your Vue component's template that is not defined in the component's instance. To fix this, make sure that the property or method you are using in the template is declared and defined in the component's `data`, `computed`, or `methods` sections.

If the property is supposed to be reactive, you can define it in the `data` section of your component. For example:

data() {
  return {
    index: 0
  };
}

If the property is a computed property, you can define it in the `computed` section. For example:

computed: {
  index() {
    // compute and return the index value
  }
}

If the property is a method, define it in the `methods` section. For example:

methods: {
  index() {
    // perform some calculations or actions and return the index value
  }
}

Make sure to check for typos or incorrect naming when referencing the property or method in your template.