js 判断用户设备类型及平台

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function IsPC() {
        var userAgentInfo = navigator.userAgent;
        var Agents = ["Android", "iPhone",
                    "SymbianOS", "Windows Phone",
                    "iPad", "iPod"];
        var flag = true;
        for (var v = 0; v < Agents.length; v++) {
            if (userAgentInfo.indexOf(Agents[v]) > 0) {
                flag = false;
                break;
            }
        }
        return flag;
    }

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var u = navigator.userAgent;
    if (u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) {
        //安卓手机
    } else if (u.indexOf('iPhone') > -1) {
        //苹果手机
    } else if (u.indexOf('Windows Phone') > -1) {
        //winphone 手机
    }

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function isWeiXin(){
        var ua = navigator.userAgent.toLowerCase();
        if(ua.indexOf('micromessenger') != -1) {
            return true;
        } else {
            return false;
        }
    }

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  <script>
    function sakuraInit() {
        $(document).snowfall('clear');
        var userAgentInfo = navigator.userAgent;
        var Agents = ["Android", "iPhone",
                    "SymbianOS", "Windows Phone",
                    "iPad", "iPod"];
        var flag = true;
        for (var v = 0; v < Agents.length; v++) {
            if (userAgentInfo.indexOf(Agents[v]) > 0) {
                flag = false;
                break;
            }
        }
        if (flag) {
            $(document).snowfall({image:"images/1.png", flakeCount:5, minSpeed:1, minSize:8, maxSize:15,});
            $(document).snowfall({image:"images/2.png", flakeCount:5, minSpeed:1, minSize:8, maxSize:15,});
            $(document).snowfall({image:"images/3.png", flakeCount:5, minSpeed:1, minSize:8, maxSize:15,});
            $(document).snowfall({image:"images/4.png", flakeCount:5, minSpeed:1, minSize:8, maxSize:15,});
        } else {
            $(document).snowfall({image:"images/1.png", flakeCount:2, minSpeed:1, minSize:8, maxSize:15,});
            $(document).snowfall({image:"images/2.png", flakeCount:2, minSpeed:1, minSize:8, maxSize:15,});
            $(document).snowfall({image:"images/3.png", flakeCount:2, minSpeed:1, minSize:8, maxSize:15,});
            $(document).snowfall({image:"images/4.png", flakeCount:2, minSpeed:1, minSize:8, maxSize:15,});
        }
    }
    window.onload = sakuraInit();
  </script>