根据变量值更改代码[重复]

This question already has an answer here:

这个问题在这里已有答案:

Convert JavaScript string in dot notation into an object reference 24 answers

将点符号中的JavaScript字符串转换为对象引用24个答案

I have the following Javascript variable:

我有以下Javascript变量:

scope.model = {
  errors: {
    email: ["error1", "error2"],
    name: ["error"]
  }
}

And I have a function as follows:

我有如下功能:

function (scope, element, attributes) {            
  if (scope.model.errors) {
    if (scope.model.errors[attributes.validator]) 
      // Do something
}

The problem is that the errors are not always on the same scope variable.

问题是错误并不总是在同一范围变量上。

I can have something like:

我可以有类似的东西:

scope.view = {
  newErrors: {
    email: ["error1", "error2"],
    name: ["error"]
  }

Inside the function I know how to get the variable where they are:

在函数内部,我知道如何获取它们所在的变量:

function (scope, element, attributes) {            

  var errors = attributes["validatorErrors"];

  // Note: errors is this case "view.newErrors"
  // So the following code would become: 

  if (scope.view.newErrors) {
    if (scope.view.newErrors[attributes.validator]) 
      // Do something
}

UPDATE

I have tried [] before but now I understand why it was not working:

我之前尝试过[],但现在我明白为什么它不起作用了:

function (scope, element, attributes) {            

  var errors = attributes["validatorErrors"];

  if (scope[errors]) {
    if (scope.[errors][attributes.validator]) 
      // Do something
}

If errors = 'errors' it will work ...

如果错误='错误',它将起作用......

If errors = 'model.errors' it won't. In this case I would need:

如果errors ='model.errors'则不会。在这种情况下,我需要:

scope['model']['errors'] ...

How can I solve this?

我怎么解决这个问题?

2 个解决方案

#1

Use the array notation:

使用数组表示法:

if (scope[errors]) {
  if (scope[errors][attributes.validator]) {
    // do something

#2

You actually already know the answer because youre using it in your example.

你实际上已经知道了答案,因为你在你的例子中使用它。

scope[newErrors][attributes.validators]

Just be careful here because it will break when scope[newErrors] is undefined. So some error handling might be needed

这里要小心,因为当scope [newErrors]未定义时它会中断。因此可能需要一些错误处理

#1