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function resetScale(){
var metalist = document.getElementsByTagName('meta');
var target = 0;
for(var i = 0; i < metalist.length; i++) {
var name = metalist[i].getAttribute('name');
if(name && name.toLowerCase() === 'viewport') {
metalist[i].setAttribute('content', 'width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no');
target = i;
break;
}
}
metalist[target].setAttribute('content', 'width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=2.0,user-scalable=yes');
}
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