when a content, and a footer,content+footer are greater than the screen height, the footer follows the content, and when the content+footer is less than the screen height, the footer is at the bottom
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when a content, and a footer,content+footer are greater than the screen height, the footer follows the content, and when the content+footer is less than the screen height, the footer is at the bottom
.now has the viewport size unit of vh. Set the parent element of content and footer to min-height: 100vh position of Footer to set relative,bottom to 0
can also be achieved with JS, first get content and footer these two elements, and then through window.innerheight to compare the two high sum, and then father-child absolute positioning.
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