body-parser模块，处理post请求

body-parser模块，处理post请求

//body-parser模块，处理post请求
var bodyParser = require('body-parser')
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())

app.all('*', function (req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header('Access-Control-Allow-Headers', "*");
    res.header("Access-Control-Allow-Methods", "*");
    res.header("Access-Control-Allow-Credentials", true);
    next();
});