问题代码:

const formData = new FormData();
formData.append("requestPrams", "RN");

fetch(url, {
          method: 'POST',
          body: formData,
          headers: {
            'content-type': 'application/json'
          },
        })

正确写法:

const formData = new FormData();
formData.append("requestPrams", "RN");

fetch(url, {
          method: 'POST',
          body: formData,
          headers: {
            'content-type': 'multipart/form-data'
          },
        })

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