尝试分配给只读属性 ECMAScript React Native

Question

我正在尝试为 Component 中声明的数组赋值。不幸的是，抛出了异常。

TypeError: Attempted to assign to readonly property

即使我删除了 strict 模式，仍然会引发异常。请有人指导我如何使变量既可读又可写？谢谢..!

代码：

class RootView extends Component {

  cachedData : []; //declared array here


//trying to assign dictionary in some function

someFunction(results) {

    this.cachedData[this.state.searchString.length - 1] = results;
    //exception raised here
}

}

Answer 1

您的语法不正确。将其添加到构造函数中。

class RootView extends Component {

  constructor() {
    super();
    this.cachedData = [];
  }
  someFunction(results) {
    this.cachedData[this.state.searchString.length - 1] = results;
  }
}

如果您的转译器支持experimental code（第0阶段），您可以使用以下内容：

class RootView extends Component {
  cachedData = [];
  someFunction(results) {
    this.cachedData[this.state.searchString.length - 1] = results;
  }
}

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