禁止移动端设备默认缩放

vue项目，在index.html添加

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">

然后在app.vue

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