当写了这了 <meta name="viewport" content="width=device-width, initial-scale=1.0,minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> ios有些手机还是可以双击屏幕放大，两个手指放大。

| 解决方式：

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