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javascript - 无法添加属性 2，对象不可扩展 Array.push

问题描述

我正在尝试将数组添加到全局数组。然后将该数组保存到AsyncStorage. 但我似乎无法做到这一点，我不知道为什么。

推送到该数组似乎有问题。

我试过按任何键，但这仍然不能解决我的问题。

//for saving all transactions

let exchanges =[ x = ''];
class AddScreen extends React.Component {

constructor(props) {
i=0;
super(props);

this.state = {text: '',  name:'',amount:'',budget:'',date:'',geoloc:''};
}

setName = () => {
const {text} = this.state;
AsyncStorage.setItem('name', text);
alert("data Saved " +text);
}

SavetoGlobalTransaction = () => {
//get everything from state
const {name} = this.state;
const {amount} = this.state;
const {budget}= this.state;
const {date}= this.state;
const {geoloc}= this.state;

trans = {
  name :this.name,amount:this.amount,budget:this.budget,date:this.date,geoloc:this.geoloc
}

exchanges.push(trans);

AsyncStorage.setItem('ex', exchanges);
alert("data Saved " +exchanges[0].name);
}

这是我得到的那种错误：

Cannot add property 2, object is not extensible
    Array.push
     <anonymous>
    Object.AddScreen._this.SavetoGlobalTransaction [as onPress]
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:2177:19
    Object.touchableHandlePress
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:15410:40
    Object._performSideEffectsForTransition
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:14990:16
    Object._receiveSignal
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:14916:14
    Object.touchableHandleResponderRelease
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:14795:12
    Object.invokeGuardedCallbackImpl
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:27408:16
    invokeGuardedCallback
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:27499:37
    invokeGuardedCallbackAndCatchFirstError
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:27503:31
    executeDispatch
     f6f1eeda-c1a7-4b01-ba0e-76dc313c6ebd:27697:9

标签： javascriptandroidreact-native

解决方案

您无法修改数组，您需要使用附加数据创建一个新数组并保存。尝试使用 .concat 或扩展运算符。

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