srcminiGoogle hangout元素是Google Web组件的元素, 用于在不同设备上与其他人进行对话。
运行以下命令以在你的项目目录中安装google hangout元素。之后, 你可以在应用程序中使用此元素：
bower install --save GoogleWebComponents/google-hangout-button例：
创建一个index.html文件并在其中添加以下代码, 以查看Polymer.js中google-hangout-buttonelement的用法。
<!doctype html>
<html>
<head>
<title>Polymer Example</title>
<script src="bower_components/webcomponentsjs/webcomponents-lite.js"></script>
<link rel = "import" href = "bower_components/polymer/polymer.html">
<link rel = "import" href = "bower_components/paper-styles/demo-pages.html">
<link rel = "import"
href = "bower_components/google-hangout-button/google-hangout-button.html">
<link rel = "import"
href = "bower_components/iron-flex-layout/classes/iron-flex-layout.html">
<style>
section {
max-width: 300px;
}
section > div {
padding: 5px;
}
</style>
</head>
<body>
<section>
<div class = "layout horizontal center">
<span class = "flex">Default button</span>
<span class = "flex"><google-hangout-button></google-hangout-button></span>
</div>
<div class = "layout horizontal center">
<span class = "flex">Narrow button</span>
<span class = "flex">
<google-hangout-button width = "70"></google-hangout-button>
</span>
</div>
</section>
</body>
</html>
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