响应式 meta 标签

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<meta name="viewport" content="width=device-width">
<meta name="viewport" content="width=device-width, initial-scale=1">

Property	Description
width	The width of the virtual viewport of the device.
device-width	The physical width of the device’s screen.
height	The height of the “virtual viewport“ of the device.
device-height	The physical height of the device’s screen.
initial-scale	The initial zoom when visiting the page. 1.0 does not zoom.
minimum-scale	The minimum amount the visitor can zoom on the page. 1.0 does not zoom.
maximum-scale	The maximum amount the visitor can zoom on the page. 1.0 does not zoom.
user-scalable	Allows the device to zoom in and out. Values are yes or no.

@-ms-viewport{
width: device-width;
}