getElementById
getElementByName --通过name属性
getElementByClassName
getElementByTagName
querySelector
querySelectorAll
document.documentElement ---获取html
document.body ---获取body
document.getElementById
document.getElementsByName
document.getElementsByClassName
document.getElementsByTagName
document.querySelector
document.querySelectorAll
document.body
document.documentElement
document.getElementById('#box')
document.getElementByName('box')
document.getElementsByClassName('')
document.getElementsByTagName()
document.querySelector('#box')
document.querySelectorAll('box')
document.body
document.documentElement
Most helpful comment
document.getElementById
document.getElementsByName
document.getElementsByClassName
document.getElementsByTagName
document.querySelector
document.querySelectorAll
document.body
document.documentElement