js判断是pc还是移动端

1、pc端写 (如果是移动端跳走)

!function(){
 function params(u, p){
        var m = new RegExp("(?:&|/?)"+p+"=([^&$]+)").exec(u);
        return m ? m[1] : '';
    }
    if(/iphone|ios|android|ipod/i.test(navigator.userAgent.toLowerCase()) == true && params(location.search, "from") != "mobile"){
        location.href = 'http://m.XXX.com';
    }
}();

2、移动端写 (如果打开是pc跳走)

!function(){
   if(/iphone|ios|android|ipod/i.test(navigator.userAgent.toLowerCase()) == false){
        location.href = 'http://XXX.com';
    }
}();

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