禁止用户缩放页面（ctrl+滚轮或者Ctrl+“-”“+”）

1.移动端H5

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

2.pc端，原生

 <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>

3.vue项目
App.vue页面中：

  methods: {
    keepRatio () {
      var ratio = 0;  // 定义一个缩放比例
      var screen = window.screen;  // 获取窗口对象
      var ua = navigator.userAgent.toLowerCase();
      if (window.devicePixelRatio !== undefined) {
        ratio = window.devicePixelRatio;  // 像素大小的比例
      }
      else if (ua.indexOf('msie')) {
        if (screen.deviceXDPI && screen.logicalXDPI) {
          ratio = screen.deviceXDPI / screen.logicalXDPI;
        }
      }
      else if (window.outerWidth !== undefined && window.innerWidth !== undefined) {
        ratio = window.outerWidth / window.innerWidth;  // 外部比例/内部比例：缩放比例
      }
      if (ratio) {ratio = Math.round(ratio * 100)}
      this.ratio = (ratio / 100).toFixed(2);
      document.body.style.zoom = 1 / this.ratio;  // 窗口视图除以缩放比例：即缩放还原
    }
  }
  mounted () {
    this.keepRatio()
    window.addEventListener('resize', () => {//监听窗口缩放
     this.keepRatio()
    });
  },

📢没了，结束了，是不是很简单呐，如有问题，欢迎留言。
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