摘要：记录下 老是容易忘<style>.back{filter:progid:DXImageTransform.Microsoft.gradient(enabled='true',startColorstr='#7F000000', endColorstr='#7F000000');background:rgba(0,0,0,0.5);width:100%;height:100%;}</style><div class="back">hello world</div> 阅读全文