用 chrome 调试， console 里有提示：
The value "device-width;" for key "width" is invalid, and has been ignored.
(index):6 The value "1.0;" for key "initial-scale" was truncated to its numeric prefix.
(index):6 The value "1.0;" for key "maximum-scale" was truncated to its numeric prefix.
(index):6 Error parsing a meta element's content: ';' is not a valid key-value pair separator. Please use ',' instead.
对应页面源码这一行：
<meta content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0" name="viewport" />
好像应该用 ‘，’ 而不是 ';'
比如这样：
<meta name="viewport" content="width=device-width, initial-scale=1.0">
The value "device-width;" for key "width" is invalid, and has been ignored.
(index):6 The value "1.0;" for key "initial-scale" was truncated to its numeric prefix.
(index):6 The value "1.0;" for key "maximum-scale" was truncated to its numeric prefix.
(index):6 Error parsing a meta element's content: ';' is not a valid key-value pair separator. Please use ',' instead.
对应页面源码这一行：
<meta content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0" name="viewport" />
好像应该用 ‘，’ 而不是 ';'
比如这样：
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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