js判断客户端

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var ua = navigator.userAgent.toLowerCase();
console.log(ua);
var isWeixin = ua.indexOf('micromessenger') != -1;
console.log('isWeixin---'+isWeixin);
var isAndroid = ua.indexOf('android') != -1;
console.log('isAndroid---'+isAndroid);
var isIos = (ua.indexOf('iphone') != -1) || (ua.indexOf('ipad') != -1);
console.log('isIos---'+isIos);