elevator.js返回顶部按钮
elevator.js 是一个 "back to top" 按钮，即点击 "back to top" 按钮即可缓慢的返回网页顶部。
示例：
<script>
// Elevator script included on the page, already.
window.onload = function() {
var elevator = new Elevator({
mainAudio: '/src/to/audio.mp3',
endAudio: '/src/to/end-audio.mp3'
});
}
// You can run the elevator, by calling.
elevator.elevate();
</script>
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