block zoom js mobile

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

1<meta 
2     name='viewport' 
3     content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0' 
4/>

1<meta 
2     name='viewport' 
3     content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0' 
4/>
5