js获取embed中对象

<embed id="myEmbed" src="example.swf" width="400" height="300">

var embedElement = document.getElementById('myEmbed');
console.log(embedElement);

var embedElements = document.getElementsByTagName('embed');
for (var i = 0; i < embedElements.length; i++) {
    console.log(embedElements[i]);
}

<embed class="embedClass" src="example.swf" width="400" height="300">

var embedElementsByClass = document.getElementsByClassName('embedClass');
for (var i = 0; i < embedElementsByClass.length; i++) {
    console.log(embedElementsByClass[i]);
}

window.onload = function() {
    var embedElement = document.getElementById('myEmbed');
    console.log(embedElement);
};

document.addEventListener('DOMContentLoaded', function() {
    var embedElement = document.getElementById('myEmbed');
    console.log(embedElement);
});