h5+plus检查手机上是否已经安装了百度地图、腾讯地图、高德地图，如果安装了就打开地图并导航过去

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Document</title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<link rel="stylesheet" type="text/css" href="../lib/css/mui.css" />
</head>
<body>
<header class="mui-bar mui-bar-nav">
    <a class="mui-action-back mui-icon mui-icon-left-nav mui-pull-left"></a>
    <h1 class="mui-title">地图</h1>
</header>
<div class="mui-content">
    <button id="nav" onclick="nav">开始导航</button>
</div>
<script src="../lib/js/mui.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
    mui.init()
    mui.plusReady(function() {
        //传入包名，检查手机上是否安装了这个应用
        function isInstall(packageName) { //
            try {
                var main = plus.android.runtimeMainActivity();
                var packageManager = main.getPackageManager();
                var PackageManager = plus.android.importClass(packageManager);
                var packageinfo = packageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES)
                if (packageinfo) {
                    return true;
                } else {
                    return false;
                }
            } catch (e) {
                return false;
            }
        }
        //批量传入包名，检查一系列应用是否安装，如果有任意一个安装了，就执行success，否认执行fail
        function operationAfterCheckInstall(mapsPackageNames, success, fail) {
            var res = mapsPackageNames.map(function(item) {
                return isInstall(item);
            })
            if (eval(res.join("||"))) {
                success();
            } else {
                fail();
            }
        }
        //可以在这里写业务逻辑了
        document.getElementById("nav").onclick = function() {
            //如果还知道其他地图的包名，也可以放这个数组里
            var mapsPackageNames = ['com.baidu.BaiduMap', 'com.autonavi.minimap', 'com.tencent.map'];
            operationAfterCheckInstall(mapsPackageNames, function() {
                var dst = new plus.maps.Point(46.1757500000,129.4252800000); // 目的地 
                var src = new plus.maps.Point(116.335, 39.966); // 起始地 可以不填
                plus.maps.openSysMap(dst, "达连河", src);
            }, function() {
                alert("您未安装百度地图、高德地图、腾讯地图,请前往应用市场下载");
            })
        }
    })
</script>
</body>
</html>
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