var ua = navigator.userAgent;var ipad = ua.match(/(iPad).*OS\s([\d_]+)/),    isIphone = !ipad && ua.match(/(iPhone\sOS)\s([\d_]+)/),    isAndroid = ua.match(/(Android)\s+([\d.]+)/),    isMobile = isIphone || isAndroid;    if(isMobile) {        location.href = 'http://m.domain.com';    }else{        location.href = 'http://www.domain.com';    ｝    //或者单独判断iphone或android     if(isIphone){        //code     else if(isAndroid){        //code    }else{        //code    }