form检测

form = document.createElement('form')
form.id = '__Zm9ybS5pZAo__'
form.action = 'https://ucenter.miit.gov.cn/login.jsp'
document.body.appendChild(form)
document.body.removeChild(form)

input_1 = document.createElement("input")
input_1.id = 'username'
input_1.content = 'action'
input_1.name = 'action'

input_2 = document.createElement("input")
input_2.name = 'textContent'
input_2.id = 'password'

input_3 = document.createElement("input")
input_3.id = 'innerText'
input_3.type = 'submit'
input_3.name = 'id'

form.appendChild(input_1)
form.appendChild(input_2)
form.appendChild(input_3)

console.log(form.action)