JS POST 失败，POSTMAN 发成功？

Question

JS POST 不执行 fetch(url ，直接到 catch(ex){FR.Logger.error(ex);FR.Msg.toast(FR.i18nText('Custom')+'JS'+FR.i18nText('Error')+' : '+ex.message);}}).createDelegate(this, [], 0).apply(this, arguments)
代码如下

debugger;
const url = 'http://***';
const username = '*****';
const password = '*****';

const Body = {
  "approver": "N8181820",
  "factory": "2022",
  "name_of_parts": "ame_of_parts",
  "document_number": "NNNNN",
  "machine_tool_type": "machine_tool_type",
  "new_version_number": "w_version_nu",
  "program_name": "program_name",
  "part_drawing_number": "part_drawin",
  "auditor": "N8181820",
  "issuing_nature": "issuing_nature",
  "list": [
    {
      "sequence_number": "111111111",
      "field1": "12",
      "modify_type": "22",
      "field3": "21321",
      "field2": "123",
      "field5": "3213",
      "field4": "321312"
    }
  ],
  "applicant": "N8181820",
  "program_number": "ogram_number",
  "attachment": "attachment",
  "procedure_description": "edure_descrip",
  "application_time": "2024-06-23",
  "machine_number": "machine_numbe",
  "tzid": "10001",
  "group_counter": "group_counter",
  "original_version_number": "ginal_versio",
  "operation_number": "operation_numbe",
  "material_code": "material_code"
};

fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Basic ' + btoa(username + ':' + password)
  },
  body: JSON.stringify(Body)
})
  .then(response => {
    if (!response.ok) {
      throw new Error('Network response was not ok ' + response.statusText);
    }
    return response.json();
  })
  .then(data => {
    // 处理响应数据
    console.log(data);
  })
  .catch(error => {
    // 处理错误
    console.error(error);
  });

Answer 1

1. 跨域？
2. 跨域包含跨协议、跨端口等
3. fetch 构建请求的过程有问题
4. 你贴的两段代码看起来不是一起的，别的错误也可能会导致直接走 catch