TypeError: Cannot read property 'body' of undefined

问题描述：在视频5分钟左右，讲到：当形参为对象时，可使用解构对象 。这里示例代码在 vs code 中运行的时候会报错

相关截图：

这是在 vs code 的 terminal 中的报错信息

(base) ➜  es6_flex_bootstrap git:(master) ✗ node test-function.js

/Library/WebServer/Documents/python/code/imooc/stage_three/es6_flex_bootstrap/test-function.js:14

function fetch(url, {body = '', method = 'GET', headers = {}}){

                     ^

TypeError: Cannot read property 'body' of undefined

    at fetch (/Library/WebServer/Documents/python/code/imooc/stage_three/es6_flex_bootstrap/test-function.js:14:22)

    at Object.<anonymous> (/Library/WebServer/Documents/python/code/imooc/stage_three/es6_flex_bootstrap/test-function.js:20:1)

    at Module._compile (internal/modules/cjs/loader.js:1063:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)

    at Module.load (internal/modules/cjs/loader.js:928:32)

    at Function.Module._load (internal/modules/cjs/loader.js:769:14)

    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)

相关代码：

​function fetch(url, {body = '', method = 'GET', headers = {}}){
    $.ajax({
        url,
        method
    })
    }
fetch()