FormData.keys()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

io error: No such file or directory (os error 2) (/home/runner/work/yari/yari/mdn/translated-content/files/zh-cn/web/api/xmlhttprequest_api/index.md)

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。

语法

js
formData.keys();

返回值

返回一个迭代器（ iterator）。

示例

js
// 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

规范

No specification found

No specification data found for api.FormData.keys.
Check for problems with this page or contribute a missing spec_url to mdn/browser-compat-data. Also make sure the specification is included in w3c/browser-specs.

浏览器兼容性

BCD tables only load in the browser

参见