iOS only can set volume by physical key, CAN NOT modify by javasript

智慧光

于 2016-08-21 22:28:45 发布

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分类专栏： iOS

本文链接：https://blog.youkuaiyun.com/wletv/article/details/52269989

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本文探讨了在iOS设备及桌面端通过JavaScript调整音量的方法。在桌面端可通过设置元素的音量属性来实现相对电脑当前音量级别的音频调节。而在iOS设备上，由于音频级别始终受用户物理控制，JavaScript无法设置音量属性。

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https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/Device-SpecificConsiderations/Device-SpecificConsiderations.html#//apple_ref/doc/uid/TP40009523-CH5-SW1

Volume Control in JavaScript

On the desktop, you can set and read the volume property of an or element. This allows you to set the element’s audio volume relative to the computer’s current volume setting. A value of 1 plays sound at the normal level. A value of 0 silences the audio. Values between 0 and 1 attenuate the audio.

This volume adjustment can be useful, because it allows the user to mute a game, for example, while still listening to music on the computer.

On iOS devices, the audio level is always under the user’s physical control. The volume property is not settable in JavaScript. Reading the volume property always returns 1.