获取指定应用的版本号
<pre><code class="language-js">function 获取指定应用的版本号(packageName) {
var pckMan = context.getPackageManager();
try {
var packageInfo = pckMan.getPackageInfo(packageName, 0);
} catch (e) {
return null;
}
return packageInfo.versionCode;
}</code></pre>