带有按钮的动态css站点可在iphone / ipad上切换到桌面版

Question

我可以动态更改css，但我无法动态更改vewport（即通过单击“桌面版本”按钮的网站不会以完整大小显示）。单击桌面图标时，它会在iphone上打开桌面版但放大..

    <script type="text/javascript">
function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name,"",-1);
}

// Responsive Design Opt Out - cookie values
c_name = "optoutresponsive";
c_value = "1";
c_expires = 365;

// Responsive Design Opt Out - user actions
function optout() {
  createCookie(c_name, c_value, c_expires);
  location.reload();
}
function optin() {
  eraseCookie(c_name);
  location.reload();
}

$(document).ready(function () {

  // Responsive Design Opt Out - helper functions
  function optedout() {
    if (readCookie(c_name) == c_value) {
      return true;
    }else {
      return false;
    };
  }
  function unlinkcss() {
    jQuery('#mobilecss').remove();
  }
  function printstatus() {
    $('#hv,#fullv').append(" ");
  }
  function renderuserselections() {
    if (!optedout()) {
      resp_html_selectors = "<div class='resp_selector_container'><input class='resp_selector' type='button' onClick='optout();' value='desktop version'/></div>"
    }
    else {
      resp_html_selectors = "<div class='resp_selector_container'><input class='resp_selector' type='button' onClick='optin();' value='mobile version'/></div>"
    }
    $('#fullv').append(resp_html_selectors);
  }

  // Main 
  if (optedout()) {
    unlinkcss();
    printstatus();
  }
  renderuserselections();

});
</script>