jQuery请求Ajax

$(function () {
      $('#but').on('click', function (e) {
        console.log(e, '123')
        $.ajax({
          method: 'get',
          url: 'https://www.runoob.com/try/try.php',
          data: { a: 1 },
          headers: {},
          contentType: 'text/plain'
        })
        $.ajax({
          method: 'post',
          url: 'https://www.runoob.com/try/try.php',
          data: { a: 1 },
          headers: {},
          contentType: 'application/x-www-form-urlencoded'
        })
        let a = new FormData()
        a.append('file', new File([], 'file', { type: 'image/jpg' }))
        $.ajax({
          method: 'post',
          url: 'https://www.runoob.com/try/try.php/a',
          data: a,
          headers: {},
          contentType: false,
          processData: false,
        })
      })
    })

默认的application/x-www-form-urlencoded 表单formdata的对象

默认的multipart/form-data 文件上传的流formdata

jQuery默认的post是 application/x-www-form-urlencoded 后端需要读表单流解析

目前的axios 是 request payload 就是 post data为字符串 然后内容属性头设置为 application/json

所以目前需要修改