方法一:

var isChrome = window.navigator.userAgent.indexOf("Chrome");

 1 <script>
 2     var isChrome = window.navigator.userAgent.indexOf("Chrome");
 3     if(isChrome !== -1){
 4         console.log(111);
 5     }
 6     else{
 7         console.log(222);
 8     }
 9 
10 </script>
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