HTML5_Audio_Visualizer
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wayou
An audio spectrum visualizer built with HTML5 Audio API
html5_audio_visualizer.js:33 The AudioContext was not allowed to start. It must be resume (or created) after a user gesture on the page. https://goo.gl/7K7WLu
Is it possible to make something like this that simply displays the current volume of the page?
mapHeight = 2 是为了计算什么  2. 另外自己做的进度条 拖拽时怎么保持同步 ？
