vue+vue-Axios+Express实现前后端简单跨域访问
文章目录vue+vue-axios环境搭建前端组件express搭建结果呈现vue+vue-axios环境搭建查看node是否安装:node -v卸载指令:npm uninstall -g vue-cli安装指令:npm install -g @vue/cli(以上步骤下次不用重复)创建test :vue create myapp(项目名称)vue-Axios 是一个基于 promise 的 HT
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分析
axios :用来发送请求(对你说的做出请求)
express:node的一个框架,开启一个web服务(监听请求的)
简单说:(axios发送请求) —> (express 响应请求)
vue+vue-Axios搭建前端环境
查看node是否安装:node -v
(如果不确定自己的版本是否过低就卸了再装)
卸载指令:npm uninstall -g vue-cli
安装指令:npm install -g @vue/cli
(以上步骤下次不用重复)
选择打开一个空文件,创建myapp :vue create myapp
(项目名称)
vue-Axios 是一个基于 promise 的 HTTP 库,可以用在浏览器和 node.js 中
在终端myapp目录下安装:npm install --save axios
前端组件
为方便我们直接改写HelloWorld.vue
<template>
<button type="button" @click="response">Click Me!</button>
</template>
<script>
import Axios from "axios";
export default {
name: "login",
methods:{
response(){
// alter(123);
Axios.get('http://localhost:3000/users').then(function(response){
console.log("你已连接!");
})
}
}
}
</script>
<style>
</style>
express搭建后端环境
完成 安装与Express 应用程序生成器两步即可.即到7
(备注:如果搭建过直接看下一次搭建新项目环境可用)
nodejs 设置跨域访问
//设置跨域访问
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
res.header("X-Powered-By",' 3.2.1')
res.header("Content-Type", "application/json;charset=utf-8");
next();
});
app.js全部代码:
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
//设置跨域访问
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
res.header("X-Powered-By",' 3.2.1')
res.header("Content-Type", "application/json;charset=utf-8");
next();
});
app.use('/', indexRouter);
app.use('/users', usersRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
结果呈现
代码clone路径:
参考:
nodejs 设置跨域访问.
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