以下代码旨在更新投票系统。通过在页面加载时显示结果,可以很好地工作。
这是我的问题:每当单击Get、Count按钮时,我都需要更新每个用户的投票。
在后端,我有php代码,它返回如下所示的数组数据。
有人能帮助我显示数组值和更新例如(投票到11)取决于用户投票方式吗?
<?php
// Update user response on a post
$return_arr[]= array("vote"=>"11");
echo json_encode($return_arr);
exit;
?>
下面是axios调
这是我的功能:
remove(element)
{
this.setState({ search: this.state.search.filter( item => item !== element ) });
}
我知道这个错误:
Warning: setState(...): Cannot update during an existing state transition (such as within `render` or another component's constructor).
Render methods should be a p
我有两个组件:App和Contact。我只想在我正在传递的联系人页面上打印id,但是当我在contact组件中console.log(this.props)时,它显示的是一个空对象。
import React from "react";
import Contact from "./Contact";
import { BrowserRouter as Router, Route, Link } from "react-router-dom";
class App extends React.Component {
render() {
我正在开发一个带有expressjs和reactjs的应用程序。我使用expressjs从后端获取数据,但我得到的是map is not a function。
import React, { Component } from "react";
import "./products.css";
import Listofproducts from "./listofproducts";
import { Link } from "react-router-dom";
class products extends Componen
假设我有: class myComponent extends Component {
myFunction() {
//I would like to loop through two iterables, and make as many rows and columns
let r;
for (let i= 0; i <= SMTH1; i++) {
//add a <tr> opening tag
for (let j= 0; j <= SMTH2; j++) {
// add a <td> openi