小编Nav*_*eer的帖子

我想在Microsoft Visual Studio Code中运行python代码,但它给出了一个错误:

"没有安装Linter pylint"

我安装了:

• VS Code Python扩展
• Python3
• 蟒蛇

我该如何安装pylint？

如何在react-redux项目错误屏幕截图中解决此错误 警告:失败的道具类型:道具store标记为必需Provider,但其值为undefined.在提供者

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import './index.css';
import SignUp from './Components/SignUp'
import SignIn from './Components/SignIn'
import Home from './Components/Home'
import { Router, Route, hashHistory, IndexRoute, browserHistory } from 'react-router';
import MuiThemeProvider from 'material-ui/styles/MuiThemeProvider';
import {firebaseApp} from './Database/firebaseApp'
import {Provider} from 'react-redux'
import {store} from './Store/Store'
import {logUser} from './Store/Actions'

ReactDOM.render(
  <MuiThemeProvider>
    <Provider store={store}>
      <Router history={browserHistory} >

        <Route path="/signup" component={SignUp} ></Route>
        <Route path="/signin" component={SignIn} …

警告:不建议通过主React包访​​问PropTypes.请改用npm中的prop-types包.

> Warning: Accessing PropTypes via the main React package is deprecated.
> Use the prop-types package from npm instead.

我该怎么办？

mapDispatchToProps中有三个函数.我想在React Component的构造函数中使用它们中的任何函数但是当我使用console.log(this.props)它时给出undefined如何在构造函数中使用这些函数从firebase数据库加载数据？

mapDispatchToProps

const mapDispatchToProps = (dispatch) => {
    return {
        addProductRequest: (data) => {
            console.log(data)
            dispatch(AddNewProduct(data))
        },
        loadProducts: () => {
            dispatch(ViewProducts())
        },
        loadStores: () => {
            dispatch(ViewStores())
        },
    }
}

构造函数

constructor() {
    super();
    this.state = {
        products: [],
        stores: [],
        currentProduct: [],
        stockAvailable: [],
        productName: '',
        description: '',
        qty: 0,
        unitPrice: 0,
        storeName: '',
        selectedProduct: '',
        productNameInStock: '',
        productQtyInStock:0
    }
    console.log(this.props)

    this.props.loadProducts();
    this.props.loadStores();

    this.submit = this.submit.bind(this);
    this.inputHandler = this.inputHandler.bind(this);
}

它给出了一个错误

未捕获的TypeError:无法读取未定义的属性"loadProducts"

我有一个 int 数组，其中包含一些从索引 0 开始的值。我想交换两个值，例如索引 0 的值应该与索引 1 的值交换。如何在 c# 数组中执行此操作？

我是反应原生的初学者.我正在使用NativeBase组件进行设计.当我使用抽屉应用程序给出此错误

undefined is not a function (evaluating '_this2.closeDrawer()')

这是错误的屏幕截图

抽屉代码在这里

import React, { Component } from 'react';
import { Drawer } from 'native-base';
import SideBar from './sidebar';
import Signup from './signup';
import { View } from 'react-native';

export default class NativeDrawer extends Component {
  render() {
    closeDrawer = () => {
      this.drawer._root.close()
    };
    openDrawer = () => {
      this.drawer._root.open()
    };
    return (
      <View>

        <Drawer
          ref={(ref) => { this.drawer = ref; }}
          content={<SideBar navigator={this.navigator} />}
          onClose={() => this.closeDrawer()} >
        </Drawer>
      </View> …

如何在reactjs中禁用material-ui datepicker中的未来日期？

我想在ReactJS中禁用今天的材料-ui之后的未来日期.如何禁用未来日期？