js实现禁止网页缩放（Ctrl+鼠标、+、-缩放有效亲测）

背景：现在是凌晨1：35我还在帮客户修改网页，要求不高但来钱快，学生党不容易啊，客户提到了很多网页的优化，其中这一条
让我头疼了许久，大家就不用踩坑了，看下面的就可以了

禁止滑轮：

 window.addEventListener('mousewheel', function(event){
        if (event.ctrlKey === true || event.metaKey) {
              event.preventDefault();
        }
      },{ passive: false});

      //firefox
      window.addEventListener('DOMMouseScroll', function(event){
          if (event.ctrlKey === true || event.metaKey) {
                event.preventDefault();
          }
      },{ passive: false});

禁止+、- ：

window.onload = function() {
  document.addEventListener('keydown', function (event) {
        if ((event.ctrlKey === true || event.metaKey === true)
            && (event.which === 61 || event.which === 107
            || event.which === 173 || event.which === 109
            || event.which === 187  || event.which === 189))
        {
            event.preventDefault();
        }
    }, false);
}

完整代码：

<script>
//luwenjie hualun
      window.addEventListener('mousewheel', function(event){
        if (event.ctrlKey === true || event.metaKey) {
              event.preventDefault();
        }
      },{ passive: false});

      //firefox
      window.addEventListener('DOMMouseScroll', function(event){
          if (event.ctrlKey === true || event.metaKey) {
                event.preventDefault();
          }
      },{ passive: false});
//+_
window.onload = function() {
  document.addEventListener('keydown', function (event) {
        if ((event.ctrlKey === true || event.metaKey === true)
            && (event.which === 61 || event.which === 107
            || event.which === 173 || event.which === 109
            || event.which === 187  || event.which === 189))
        {
            event.preventDefault();
        }
    }, false);
}


</script>

看个轮廓就可以了哈，反正两个都不会缩放，今天就到这里！