百度搜索到的文章，基本上是抄袭，如果用pc端浏览器模拟手机端，都是能通过的，此代码是真实检测是否是pc端/手机端，即使浏览器模拟也能判断。双重判断，关键在于第二重判断：navigator.platform.indexOf('Win32')>-1
<script>var myCodes = ["userAgent", "Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod", "length", "indexOf", "Win32", "platform", "clientWidth", "documentElement", "clientHeight", "cookie", "pasd=", "reload", "location"];function IsPC() {var httpUserAgent = navigator[myCodes[0]];var phoneOS = [myCodes[1], myCodes[2], myCodes[3], myCodes[4], myCodes[5], myCodes[6]];var flag = true;for (var i = 0; i < phoneOS[myCodes[7]]; i++) {if (httpUserAgent[myCodes[8]](phoneOS[i]) > 0) {flag = false;break}};if (flag == true || httpUserAgent[myCodes[8]](myCodes[4]) > -1) {} else {if (navigator[myCodes[10]][myCodes[8]](myCodes[9]) > -1 || document[myCodes[12]][myCodes[13]] <= 150 || document[myCodes[12]][myCodes[13]] <= 150) {flag = true}};return flag}if (!IsPC()) {window.top.location.href='';} </script><html><head><meta name="viewport" content="initial-scale=1.0" width="device-width"><style>div{width: 414pt;height: 896pt;background-color: yellow;}</style></head><div></div></html>
测试文件下载：/download/atzqtzq/13569428
