<div class="i-gd-header" id="header" style="background: rgba(255,255,255,0)"> <div class="i-gd-header-left" onclick="closeWindiw(isApp)"><i class="iconfont icon-fanhui"></i></div> <div class="i-gd-header-center">商品详情</div> <div class="i-gd-header-right"> <div class="iconfont icon-xin"></div> <div class="iconfont icon-fenxiang3"></div> </div> </div>
.i-gd-header { position: fixed; top: 0; left: 0; z-index: 91; width: 100%; background-color: #fff; display: flex; align-items: center; font-size: 14px; height: 45px; } .i-gd-header-left { width: calc(30% - 20px); padding: 0 10px; } .i-gd-header-left i { font-weight: bold; color: #333; } .i-gd-header-center { text-align: center; width: 40%; font-size: 16px; color: rgba(0,0,0,0); } .i-gd-header-right { width: calc(30% - 20px); padding: 0 10px; display: flex; align-items: center; flex-direction: row-reverse; } .i-gd-header-right .iconfont{ color: #fff; font-size: 16px; z-index: 99; background: #666; margin-left: 8px; width: 30px; height: 30px; display: flex; align-items: center; justify-content: center; border-radius: 50%; }
$(document).scroll(function() { var scroH = $(document).scrollTop(); //滚动高度 var nums = scroH/500;//距离顶部高度超过500px时完全不透明 $(".i-gd-header-center").css("color",'rgba(0,0,0,'+nums+')'); $(".i-gd-header").css("background",'rgba(255,255,255,'+nums+')'); $(".i-gd-header-right .iconfont").css("background",'rgba(102, 102, 102,'+(1 - nums)+')'); $(".i-gd-header-right .iconfont").css("color",'rgb('+(255 - ((255 - 102)/2)*nums)+', '+(255 - ((255 - 102)/2)*nums)+', '+(255 - ((255 - 102)/2)*nums)+')'); });