window.navigator.userAgent用来区分设备和浏览器
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>判断浏览器的环境</title>
</head>
<body>
</body>
<script>
if (/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {
alert(navigator.userAgent+'现在移动端打开的')
} else {
alert(navigator.userAgent+'现在是pc端打开的')
}
var wx = (function () { return navigator.userAgent.toLowerCase().indexOf('micromessenger') !== -1 })();
if (wx) {
alert(navigator.userAgent+"是微信");
} else {
alert(navigator.userAgent+"不是微信");
}
alert(navigator.userAgent.toLowerCase());
</script>
</html>