viewport

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

上面这行代码的意思是，网页宽度默认等于屏幕宽度(width=device-width),原始缩放比例(initial-scale=1)

为1.0，即网页初始大小占屏幕面积的100%.

<meta name="viewport" content="width=device-width,initial-scale=1.0, maximum-scale=1.0,user-scalable=no"/>