##设置页面高度为浏览器可视窗口大小##
<!DOCTYPE html><html><head><meta charset="UTF-8"><title>title</title><style>html,body {margin: 0;padding: 0;width: 100%;height: 100%;}.demo {background-color: #cccccc;margin: 0 auto;width: 100%;height: 100%;}</style></head><body><div class="demo"></div></body></html>
