<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no"> <title>判断手机是否安装微信</title> </head> <body> <a href="javascript:testApp(‘weixin://‘)" class="dl-btn" id="download">打开微信</a> <script> function testApp(url) { var timeout, t = 1000, hasApp = true; setTimeout(function () { if (!hasApp) { //没有安装微信 var r=confirm("您没有安装微信，请先安装微信!"); if (r==true){ location.href="http://weixin.qq.com/" } }else{ //安装微信 } document.body.removeChild(ifr); }, 2000) var t1 = Date.now(); var ifr = document.createElement("iframe"); ifr.setAttribute(‘src‘, url); ifr.setAttribute(‘style‘, ‘display:none‘); document.body.appendChild(ifr); timeout = setTimeout(function () { var t2 = Date.now(); if (!t1 || t2 - t1 < t + 100) { hasApp = false; } }, t); } </script> </body> </html>
原文：https://www.cnblogs.com/wuhairui/p/11984432.html