formData()的参数

回答: FormData()的参数可以是一个表单元素，用于初始化一个FormData对象，也可以不传入任何参数，直接创建一个空的FormData对象。如果传入一个表单元素作为参数，FormData对象会根据表单元素中的字段自动填充数据。\[2\]如果不传入参数，可以通过append()方法来添加数据。\[2\]
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