<!DOCTYPE html><html><head> <style> html { position: relative; min-height: 100%; } #footer { height: 70px; width: 100%; background-color: black; position: absolute; bottom: 0; } #div1 { width: 100%; height: 100%; height: 1500px; background-color: slategrey; } </style></head><body> <div id="div1">div1</div> <div id="footer">footer</div></body></html>如何在保证现在效果的情况下，去掉div1的height少于一屏的时候，div1还能占满全屏
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