javascript实现fetch请求返回的统一拦截

  const obj = {};
Object.defineProperty(obj, 'text', {
 get: function() {
  console.log('get val'); 
 },
 set: function(newVal) {
  console.log('set val:' + newVal);
  document.getElementById('input').value = newVal;
  document.getElementById('span').innerHTML = newVal;
 }
});

const input = document.getElementById('input');
input.addEventListener('keyup', function(e){
 obj.text = e.target.value;
})

Object.defineProperty(obj, prop, descriptor);

const originFetch = fetch;
Object.defineProperty(window, "fetch", {
 configurable: true,
 enumerable: true,
 // writable: true,
 get() {
  return (url,options) => {
   return originFetch(url,{...options,...{
    headers: {
     'Content-Type': 'application/json;charset=UTF-8',
     Accept: 'application/json',
     token:localStorage.getItem('token') 
     //这里统一加token 实现请求拦截
    },...options.headers
   }}).then(checkStatus) 
   // checkStatus 这里可以做返回错误处理，实现返回拦截
  .then(response =>response.json())
 }
});