我也是看了几个大神的博客才总结出自己的笔记的，虽然有抄来之嫌，但是总觉得自己不写点，好像自己不认识，也不放心

function openApp(){
    //var ua = window.navigator.userAgent.toLowerCase();
    if (navigator.userAgent.match(/(iPhone|iPod|iPad);?/i)) {
        var urlStr = "weixin://"; 
        var UIApplication = plus.ios.import("UIApplication");
        var NSURL = plus.ios.import('NSURL');
        var demo = NSURL.URLWithString(urlStr);
        var application = UIApplication.sharedApplication();
        var a = application.openURL(demo);
        if(!a){
            var urlStr = "";//下载地址
            var UIApplication = plus.ios.import("UIApplication");
            var NSURL = plus.ios.import('NSURL');
            var demo = NSURL.URLWithString(urlStr);
            var application = UIApplication.sharedApplication();
            application.openURL(demo) 
        }
        plus.ios.deleteObject(demo);
        plus.ios.deleteObject(application);
   }else if (navigator.userAgent.match(/android/i)) { 
        try{
            var Intent = plus.android.importClass("android.content.Intent");
        
            var intent = new Intent(Intent.ACTION_VIEW);
            
            var ComponentName = plus.android.importClass("android.content.ComponentName");
            //var comp = new ComponentName("你的安卓APK的Package，在AndroidManifest.xml里面，比如yy.com.testandriodapp", "你的安卓APK启动控制器，比如yy.com.testandriodapp.MainActivity");

            var comp = new ComponentName("vip.chinazt.ztuser", "vip.chinazt.ztuser.ui.LeadActivity");
            
            intent.setComponent(comp);
            
            var main = plus.android.runtimeMainActivity();
            
            main.startActivity(intent);
        }catch(e){
            //console.log(e);
            window.location.href='http://a.app.qq.com/o/simple.jsp?pkgname=vip.chinazt.ztuser';
            return;
        }
    }
}