fetch-post请求正确姿势

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fetch发送post请求，不用url传参数

地址栏url传参数有尺寸限制，从2k-8k不等

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fetch("http://www.example.org/submit.php", {
  method: "POST",
  headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/x-www-form-urlencoded'
  },
  body: "userName=&password=admin"
}).then(function(res) {
  if (res.ok) {
    alert("Perfect! Your settings are saved.");
  } else if (res.status == 401) {
    alert("Oops! You are not authorized.");
  }
}, function(e) {
  alert("Error submitting form!");
});

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