document.getElementById('myControl').focus()在PhoneGap中不起作用

window.onload = function() {
  document.getElementById('myControl').focus();
};

document.addEventListener('DOMContentLoaded', function() {
  document.getElementById('myControl').focus();
});

document.addEventListener('deviceready', function() {
  document.getElementById('myControl').focus();
}, false);

 <param name="android-package" value="com.cordova.plugin.keyboard.Keyboard" />
</feature>

window.Keyboard.hide();

setTimeout(function() {
  document.getElementById('myControl').focus();
}, 1000);