解决ios10以上点击缩放的问题

禁止ios10以上点击缩放，代码如下：

 <script>
      window.onload=function () {
        document.addEventListener('touchstart',function (event) {
          if(event.touches.length>1){
            event.preventDefault();
          }
        });
        var lastTouchEnd=0;
        document.addEventListener('touchend',function (event) {
          var now=(new Date()).getTime();
          if(now-lastTouchEnd<=300){
            event.preventDefault();
          }
          lastTouchEnd=now;
        },false);
        document.addEventListener('gesturestart', function (event) {
          event.preventDefault();
        });
      }
    </script>

　　原文链接：https://juejin.im/post/5b46ec375188251ac9767094