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.
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
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