三方登录 提示未安装客户端

mui登录模板中实现了是否安装应用的判断，你可以参考一下。

核心代码：

 function isInstalled(id) {  
    if (mui.os.android) {  
        var main = plus.android.runtimeMainActivity();  
        var packageManager = main.getPackageManager();  
        var PackageManager = plus.android.importClass(packageManager)  
        var packageName = {  
            "qq": "com.tencent.mobileqq",  
            "weixin": "com.tencent.mm",  
            "sinaweibo": "com.sina.weibo"  
        }  
        try {  
            return packageManager.getPackageInfo(packageName[id], PackageManager.GET_ACTIVITIES);  
        } catch (e) {}  
    } else {  
        switch (id) {  
            case "qq":  
                var TencentOAuth = plus.ios.import("TencentOAuth");  
                return TencentOAuth.iphoneQQInstalled();  
            case "weixin":  
                var WXApi = plus.ios.import("WXApi");  
                return WXApi.isWXAppInstalled()  
            case "sinaweibo":  
                var SinaAPI = plus.ios.import("WeiboSDK");  
                return SinaAPI.isWeiboAppInstalled()  
            default:  
                break;  
        }  
    }  
}