强制不允许用户缩放页面

<script>
 
    document.addEventListener('mousewheel', function (e) {
 
      e = e || window.event;
 
      if ((e.wheelDelta && event.ctrlKey) || e.detail) {
 
        event.preventDefault();
 
      }
 
    }, {
 
      capture: false,
 
      passive: false
 
    });
 
    document.addEventListener('keydown', function (event) {
 
      if ((event.ctrlKey === true || event.metaKey === true)
 
        && (event.keyCode === 61 || event.keyCode === 107
 
          || event.keyCode === 173 || event.keyCode === 109
 
          || event.keyCode === 187 || event.keyCode === 189)) {
 
        event.preventDefault();
 
      }
 
    }, false);
 
  script>