道可道

obj中length为指针 指向索引2 调用 obj.push(1) 等同于 obj[obj.length] = 1 length++ 调用 obj.push(2) 等同于 obj[obj.length] = 2 length++ 所以 变为 [,,1,2]

[详情](https://codepen.io/dongCode/pen/WVQpzN?editors=0011)

express.json() just for Content-Type: application/json try this middleware ? like this demo `import express from 'express'; const app = express(); app.use((req, res, next) => { if (req.is('application/ld+json')) { req.body =...