在React中如何在setState调用中使用字符串作为键

Question

I have a method in which I am attempting to call a state value for through a string. Essentially, the string is "greeting" and the state value is greeting: "hello world".

However, since the variable is a string "greeting", I am not able to call this.state.greeting with it and it gives me undefined. How can I convert a string to a variable so that it can be used to call this.state in React? I have experimented with the eval() method but it has not seemed to work.

Answer 1

this.state ['greeting']应该可以工作

Answer 2

您可以使用this.state [“ greeting”]

Answer 3

You can access it with javascript object bracket notation like so:

var myObj = {
  'greeting': 'hello world'
};

var myKey = 'greeting';

console.log(myObj[myKey]);        // 'hello world'