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FormData 接口提供了一种表示表单数据的键值对的构造方式，经过它的数据可以使用 XMLHttpRequest.send() 方法送出，本接口和此方法都相当简单直接。如果送出时的编码类型被设为 "multipart/form-data"，它会使用和表单一样的格式。

你也可以将它直接传递给构造器 URLSearchParams， if you want to generate query parameters in the way a <form> would do if it were using simple GET submission.

An object implementing FormData can directly be used in a for...of structure, instead of entries(): for (var p of myFormData) is equivalent to for (var p of myFormData.entries()).

构造函数

FormData()

创建一个新的 FormData 对象。

方法

FormData.append()

Appends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist.

FormData.delete()

Deletes a key/value pair from a FormData object.

FormData.entries()

Returns an iterator allowing to go through all key/value pairs contained in this object.

FormData.get()

Returns the first value associated with a given key from within a FormData object.

FormData.getAll()

Returns an array of all the values associated with a given key from within a FormData.

FormData.has()

Returns a boolean stating whether a FormData object contains a certain key.

FormData.keys()

Returns an iterator allowing to go through all keys of the key/value pairs contained in this object.

FormData.set()

Sets a new value for an existing key inside a FormData object, or adds the key/value if it does not already exist.

FormData.values()

Returns an iterator allowing to go through all values contained in this object.