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                ~~~ <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script src="https://cdn.bootcss.com/vue/2.5.18-beta.0/vue.js"></script> <style> *{margin:0;padding:0} .navbar{ line-height: 80px; text-align: center; background: pink; position: fixed; width: 100%; left: 0; top:0; } .content{ height:2000px; } </style> </head> <body> <div id="app"> <div class="navbar" :style="filter">導航</div> <div class="content"></div> </div> <script> new Vue({ el:"#app", data:{ filter:{ opacity:0 } }, mounted() { var self=this; window.onscroll=function(){ var top=document.documentElement.scrollTop; /*top=200時 opacity是1*/ var opacity=top/200; if(opacity>=1){ opacity=1; } self.filter.opacity=opacity; } }, }) </script> </body> </html> ~~~ ![](https://box.kancloud.cn/f1661c92f5335df4b9bf70b801d7c246_1366x239.png) ![](https://box.kancloud.cn/422e969e1812b8ee81bf6f64c6bcbe21_1360x295.png) ![](https://box.kancloud.cn/4b9f488e639802428f05452f2345a120_1366x325.png)
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