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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/API/FormData/keys below:

FormData.keys() - Web API | MDN

Baseline Widely available

备注： 此特性在 Web Worker 中可用。

FormData.keys() 该方法返回一个迭代器（iterator），遍历了该 formData 包含的所有 key，这些 key 是 USVString 对象。

返回一个迭代器（ iterator）。

// 先创建一个 FormData 对象
var formData = new FormData();
formData.append("key1", "value1");
formData.append("key2", "value2");

// 输出所有的 key
for (var key of formData.keys()) {
  console.log(key);
}

结果如下：

key1
key2

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