Ecmascript 6 试图分配给只读属性ECMAScript React Native
我正在尝试为我的Ecmascript 6 试图分配给只读属性ECMAScript React Native,ecmascript-6,react-native,Ecmascript 6,React Native,我正在尝试为我的组件中声明的数组赋值。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 fu
组件中声明的数组赋值。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
}
}
你的语法不正确。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transpiler支持(阶段0),则可以使用以下功能:
class RootView extends Component {
cachedData = [];
someFunction(results) {
this.cachedData[this.state.searchString.length - 1] = results;
}
}
哇this.cachedData=[]代码>工作!!但是cachedData=[]代码>不工作。非常感谢你。您能告诉我语法是怎么错的吗?您有cachedData:[]
,它用于为对象分配属性。