错误:var 是一个保留字 - React native

Question

我在 React Native 中制作了一个简单的 ListView。我收到错误，如下所示。我在网上搜索，但找不到相关帖子。代码如下。

import React, {Component} from "react";
import {StyleSheet, View, AppRegistry, ListView, Text} from "react-native";
class dhrumil extends Component{
constructor(props){
super(props);
this.state = {
var ds = new ListView.DataSource({rowsHasChanged : (r1,r2) => r1!==r2})
return {
dataSource: ds.cloneWithRows(["1","2","3","4","5"])
};
}
}
_renderer(rowData){
  return <Text>{rowData}</Text>;
}
render(){
return(
<ListView
dataSource = {() => this.state.dataSource}
renderRow = {() => this._renderer()}
/>
);

}
}
AppRegistry.registerComponent("dhrumil",()=>dhrumil);

我该如何解决？

Answer 1

你在构造函数中编写了错误的编码

constructor(props) {
    super(props);
    var ds = new ListView.DataSource({rowsHasChanged : (r1,r2) => r1!==r2})
    this.state = {
        dataSource: ds.cloneWithRows(["1","2","3","4","5"])
    };
}